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1990 (227)
61Author    H. Nishihara, K. Hayashi, M. Naito, T. Butz, A. Lerf, S. SaibeneRequires cookie*
 Title    NQR and Low-Field NMR of 181 Ta in the Low-Temperature CDW State of 2 H-TaS 2  
 Abstract    NQR and low-field NMR spectra of 18I Ta are reported to probe the electronic environment of inequivalent tantalum sites in the low-temperature CDW state of a layered compound 2 H-TaS 2 . The overall features are found to be consistent with the structure consisting of nine-atom snowflake clusters in a locally commensurate CDW state. 
  Reference    Z. Naturforsch. 45a, 412—414 (1990); received August 23 1989 
  Published    1990 
  Keywords    NQR, NMR, 181 Ta, CDW, TaS 2 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0412.pdf 
 Identifier    ZNA-1990-45a-0412 
 Volume    45 
62Author    H. Riesemeier, H. Kamphausen, J. Pattloch, G. Stadermann, K. LüdersRequires cookie*
 Title    NQR and Zeeman Split NQR Investigations on Oriented YBa 2 Cu 3 0 7 _ a and Non-Oriented Bi-Ca-Sr-Cu-O Powder  
 Abstract    Powder samples of YBa 2 Cu 3 0 7 _ a were oriented by mechanically vibrating the powder at 2.4 K in a magnetic field of 1.2 T. Zeeman split NQR spectra of 63,65 Cu were obtained for the two different Cu sites. The data confirm the orientations of the principal axis system: x || c for the Cu (1) site and z || c for the Cu (2) site. Asymmetry parameters were determined for the two Cu sites yielding fj x = 0.95 ±0.2 and fj 2 = 0.008 ± 0.002. At the Cu(l) site local variations of the symmetry of the EFG tensor were observed. For the Cu sites (Cu0 2 -layers) in the Bi 2 Ca 2 Sr 2 Cu 3 0 J . phase a nearly axially symmetric EFG tensor was found. 
  Reference    Z. Naturforsch. 45a, 415—418 (1990); received September 25 1989 in revised form November 21 1989 
  Published    1990 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0415.pdf 
 Identifier    ZNA-1990-45a-0415 
 Volume    45 
63Author    H. Riesemeier, J. Pattloch, E. W. Scheidt, M. Schaefer, K. LüdersRequires cookie*
 Title    Temperature Dependence of the NQR Frequency and Linewidth of the High-J c Superconductor YBa 2 Cu 3 0 7 _ 5  
 Abstract    For YBa 2 Cu 3 0 7 _ a powder samples of different average grain sizes the temperature dependences of 63 Cu NQR frequencies and signal intensities are reported for the Cu (1) site in a temperature range of 4 300 K. Both quantities show a non-monotonic behaviour in the vicinity of the superconduction transition temperature T c . In the superconducting state the line shape of the NQR signal in zero-field depends on the strength of the dc magnetic field applied during the cooling-procedure. The resulting linewidth yields information about the internal trapped magnetic field. 
  Reference    Z. Naturforsch. 45a, 419—422 (1990); received September 251989 in revised form November 211989 
  Published    1990 
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 Identifier    ZNA-1990-45a-0419 
 Volume    45 
64Author    Y. Nakamichi, K. Kumagai, H. Nakajima, T. FujitaRequires cookie*
 Title    63/65 Cu _ N Q R Study of i m p ur ity-lnduced Magnetic Order in YBa 2 (Cu 1 _ x M x ) 3 0 7 (M = Fe, Co)  
 Abstract    We have studied 63 ' 65 Cu NQR at the Cu(l)-chain and Cu(2)-plane site of YBa 2 (Cu!_ X M X) 3 0 7 (M = Fe, Co). The spin-lattice relaxation rate, Tj -1 , is enhanced at low temperatures and has in the Fe-system a peak at 2 and 4 K for x = 0.005 and 0.015, respectively. Below the peak temperatures the intensity of the Cu-NQR signal decreases rapidly. The results suggest that magnetic ordering of either Fe or Cu moments occurs without destroying the superconductivity below T c on substituting Cu by magnetic ions. superconductor, YBa 2 (Cu 1 _ ;t Fe JC)30 7 . 
  Reference    Z. Naturforsch. 45a, 423—428 (1990); received September 141989 in revised version December 11989 
  Published    1990 
  Keywords    NQR, Magnetic order, High-T c 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0423.pdf 
 Identifier    ZNA-1990-45a-0423 
 Volume    45 
65Author    M. Tei, H. Takai, K. Mizoguchi, K. KumeRequires cookie*
 Title    Cu NQR Study on Transverse Relaxation Rate below T c in YBa 2 Cu 3 0 7  
 Abstract    The transverse relaxation rate T 2 l was measured in YBa 2 Cu 3 0 7 from 4.2 to 100 K in zero magnetic field. It showed a sudden drop just below T c down to 1/3 of that above T c . A cusp-shaped sharp peak of Tf 1 was found at 35 K for Cu(2) (plane) site, but not for Cu(l) (chain) site. Except the peak, all the behavior can be interpreted by the model of Pennington et al. that the origin of T 2 1 at 100 K is mainly the local field fluctuation by the Cu d-electron and secondly the indirect nuclear spin-spin coupling via superexchange interaction between Cu-ions. Below T c the former is sup-pressed. 
  Reference    Z. Naturforsch. 45a, 429—432 (1990); received August 22 1989 in revised form October 30 1989 
  Published    1990 
  Keywords    Nuclear quadrupole resonance, High T c superconductor, Transverse relaxation rate, Super-exchange interaction, Electron spin fluctuation 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0429.pdf 
 Identifier    ZNA-1990-45a-0429 
 Volume    45 
66Author    K. Kumagai, Y. Nakamura, I. Watanabe, H. Nakajima, T. C. Superconductivity, La, _.J M, C. Cu0Requires cookie*
 Title    Studies of 139 La and 63/65 Cu-NQR in La 2 _ x M x Cu0 4 (M = Ba, Sr)  
 Abstract    The nuclear quadrupole resonance of 139 La and 63/65 Cu in La 2 _ JC M x Cu0 4 (M = Ba, Sr) is inves-tigated for x up to unity. The shift of the resonance frequency of 139 La-NQR for 0.01 <x <0.05 indicates an anomalous change of the quadrupole interactions at T*, where the frustrated magnetic phase appears. The Cu-NQR reveals clear changes of T{~ 1 and T 2 ~ 1 and also of the profile of the Cu-NQR spectra with increasing x beyond x = 0.3~0.4, suggesting a suppression of antiferromag-netic fluctuations by hole-doping, and also a change of the electronic state of the La-system around x = 0.3 ~0.4. 
  Reference    Z. Naturforsch. 45a, 433—438 (1990); received September 19 1989 
  Published    1990 
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 Identifier    ZNA-1990-45a-0433 
 Volume    45 
67Author    P. Ganal, T. Butz, A. Lerf, M. Naito, H. NishiharaRequires cookie*
 Title      
 Abstract    With a high resolution time differential perturbed angular correlation spectrometer we investi-gated the nuclear quadrupole interaction of Ta in 1 T-TaS 2 . The results obtained for the commen-surate charge density wave phase lead to a revised assignment of the previously observed 181 Ta NQR resonances. Differences in the intra-cluster architecture of the 13-atom Star of David cluster between 1 T-TaS 2 and 1 T-TaSe 2 could be responsible for the metal to semiconductor transition which occurs in lT-TaS 2 but not in lT-TaSe 2 . 
  Reference    Z. Naturforsch. 45a, 439—444 (1990); received August 22 1989 
  Published    1990 
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 Identifier    ZNA-1990-45a-0439 
 Volume    45 
68Author    T. Okuda, T. Ueki, K. Yamada, S. Ichiba, K. Atobe, H. YoshidaRequires cookie*
 Title    NQR Investigations of La 3 _ x Ba 3+;c Cu 6 0 3 , (x = 0, 0.75, 1)  
 Abstract    NQR spectra due to 63 Cu and 139 La have been recorded for Laj^Baj+^CugO (x = 0, 0.75, 1). Two groups of 63 Cu NQR lines were observed (around 20-23 MHz and 29-36 MHz). The former is assigned to the Cu atoms in the Cu0 4 square planar groups, and the latter to that in the CuO s square pyramidal group. For the 63 Cu NQR lines in La3Ba 3 Cu 6 0 , the time dependent NQR spectra and the temperature dependence of NQR frequencies were observed. Keywords: La 3 _ :c Ba3 +J(.Cu 6 0) , system, 63 Cu NQR, 139 La NQR, Temperature dependence, Site assignment. 
  Reference    Z. Naturforsch. 45a, 445—448 (1990); received August 22 1989 in revised form November 22 1989 
  Published    1990 
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 Identifier    ZNA-1990-45a-0445 
 Volume    45 
69Author    R.J C BrownRequires cookie*
 Title    Anomalous Temperature Dependence of NQR Frequencies  
 Abstract    The anomalous temperature dependence of NQR frequencies which is often observed in crystals in which there is reorientational motion of ions or molecules is considered. Two theories of the phenomena, the jump rotation theory and the pseudo-spin theory, are described, and their successes and failures are discussed. The importance of considering other properties such as pressure depen-dence of NQR, heat capacity, and elastic constants is emphasized, and it is shown that neither theory is entirely satisfactory at present. 
  Reference    Z. Naturforsch. 45a, 449—458 (1990); received August 23 1989 
  Published    1990 
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 Identifier    ZNA-1990-45a-0449 
 Volume    45 
70Author    T. J. Bastow, S. N. StuartRequires cookie*
 Title    N and 39 K Nuclear Quadrupole Coupüng in KN0 3  
 Abstract    The nuclear quadrupole interaction tensors of 14 N and 39 K in potassium nitrate at room temper-ature have been determined from nuclear magnetic resonance (NMR) rotation studies of single crystals at 9.4 T. Values for the coupling constants and asymmetry parameters at 296 K are 14 N: e 2 qQ/h = 751 kHz, >7 = 0.022; 39 K: e 2 qQ/h = 1326kHz, i/ = 0.171. The temperature dependence, on approaching the order-disorder phase transition near 401 K, is linear. 
  Reference    Z. Naturforsch. 45a, 459—463 (1990); received August 22 1989 
  Published    1990 
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 Identifier    ZNA-1990-45a-0459 
 Volume    45 
71Author    Hiroshi Yamamoto, Atsushi Ishikawa, Tetsuo Asaji, Daiyu NakamuraRequires cookie*
 Title    A Study of Complex Anionic Motions in (Me 2 NH 2 )2ZnCl4 Crystals by Means of Chlorine Nuclear Quadrupole Resonance Techniques  
 Abstract    Three 35 C1 NQR frequencies were observed for (Me 2 NH 2) 2 ZnCl 4 at room temperature, indicat-ing the existence of three crystallographically nonequivalent chlorines in the crystal. With decreasing temperature, the frequency of the lines increased almost linearly and disappeared below ca. 220 K near the reported phase transition temperature (ca. 215 K) detected on cooling. The three NQR lines faded out above room temperature because of the occurrence of rapid anionic reorientational motions disclosed from measurements of the 35 C1 NQR spin-lattice relaxation time. 
  Reference    Z. Naturforsch. 45a, 464—466 (1990); received October 5 1989 
  Published    1990 
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 Identifier    ZNA-1990-45a-0464 
 Volume    45 
72Author    Atsushi Ishikawa, Tetsuo Asaji, Daiyu Nakamura, Ryuichi IkedaRequires cookie*
 Title    Chlorine Nuclear Quadrupole Relaxation Studies on Ionic Dynamics and Phase Transition in NH 4 AUC1 4  
 Abstract    Chlorine NQR frequencies, and NQR spin-lattice and spin-spin relaxation times (Tjq and T 2Q) were measured for NH 4 AuC14 crystals at various temperatures between 4.2 and 337 K. Each of the two resonance lines observed at room temperature is split into a doublet below T c = 29 K, indicating a phase transition. A rapid decrease of T 1Q above ca. 290 K is attributable to 90° reorientational jumps of the complex anion about its pseudo C 4 axis. An activation energy of 80 kJ mol ~ 1 was obtained for this motion. 35 C1 T 1Q exhibits a minimum at T c . The Tig isotope ratio T 1Q (37 C1)/ T 10 (35 C1) becomes 1.6 and 1.0 on the high-and low-temperature sides of this minimum, respectively. These results were explained by fluctuations of the electric field gradient produced at the chlorine nuclei by the reorientational jumps of the NH 4 ions. The motion of the cations is much faster and much slower than the resonance frequencies on the high-and low-temperature sides, respectively. This suggests that the phase transition is of the order-disorder type relating to the orientation of the NH; ion. 
  Reference    Z. Naturforsch. 45a, 467—471 (1990); received August 25 1989 
  Published    1990 
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 Identifier    ZNA-1990-45a-0467 
 Volume    45 
73Author    Masao Hashimoto, Takahiro Isono, Haruo Niki, Takuya HigaRequires cookie*
 Title    Fade-Out of 35 C1 NQR in Chloral n-Butylhemiacetal  
 Abstract    Continuous wave and pulsed NQR, dielectric absorption and infrared (IR) measurements were carried out to investigate the origin of the peculiar temperature dependence of the S/N ratio of the 35 C1 NQR in the title compound. The dielectric and IR experiments evidenced a thermally activated jumping motion of the H atom participating in O-H O H-bonds. As T x and T 2 below 120 K were much longer than T 2 * of about 10 us, the line broadening in this temperature region was attributed to static lattice defects. A random freezing of the jumping motion may be the origin of the defects. In the range 120-170 K, S/N was extremely low and T 2 was less than 10 |is, probably having a minimum in between. The short T 2 is considered to be responsible for the low S/N. A minimum of S/N at about 240 K is attributed to a 7\ minimum (less than 10 (is) at that temperature. 
  Reference    Z. Naturforsch. 45a, 472—476 (1990); received August 26 1989 in revised form December 1 1989 
  Published    1990 
  Keywords    NQR, Relaxation times, Hydrogen bond, Dielectric absorption, Disordered structure 
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 Identifier    ZNA-1990-45a-0472 
 Volume    45 
74Author    Yutaka Tai, Tetsuo Asaji, Daiyu Nakamura, Ryuichi IkedaRequires cookie*
 Title    Chlorine Nuclear Quadrupole Relaxation due to the Motion of Pyridinium Cations in Pyridinium Hexachlorometallates(IV): (pyH) 2 MCl 6 (M = Sn, Pb, Te)  
 Abstract    The temperature dependence of the chlorine quadrupole spin-lattice relaxation time T 1Q was observed for one of the three 35 C1 NQR lines of (pyH) 2 MCl 6 (M = Sn, Pb, Te). Each 7 Q curve can be devided into three temperature regions. In the low-and high-temperature regions, T 1Q is domi-nantly determined by the relaxation mechanism due to the libration and reorientation of [MC1 6 ] 2_ , respectively. In the intermediate temperature region, T 1Q results from the modulation of the electric field gradient by the motion of the neighboring pyridinium cations. This way the reorientational motion of the cation between potential wells with nonequivalent depths is precisely characterized. 
  Reference    Z. Naturforsch. 45a, 477—480 (1990); received August 25 1989 
  Published    1990 
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 Identifier    ZNA-1990-45a-0477 
 Volume    45 
75Author    Haruo Niki, Ryokan Igei, Takuya Higa, Masao Hashimoto, Takahiro IsonoRequires cookie*
 Title    Lattice Imperfections and Relaxation of Cl NQR in Chloral Iso-Butylhemiacetal  
 Abstract    The temperature dependence of the S/N ratios of three 35 C1 NQR lines (v l5 v 2 , v 3) in chloral iso-butylhemiacetal shows interesting features in the range 77-300 K. 35 C1 T y indicates that above 220 K reorientation of CC1 3 is excited, and this results in a gradual decrease in S/N. The activation energy calculated from 35 C1 NQR T l results is 30 kJ mol -1 for v x and v 2 but 25 kJ mol -1 for v 3 . The difference seems to be attributable to the motion of H in the OH group. A minimum of 35 C1 NQR T 2 is found around 180 K but 35 C1 T\ shows no anomaly. 35 C1 T 2 determines the S/N ratios in the range between 130-220 K. The line broadening below 130 K is attributable to an inhomo-geneity of the electric field gradient at resonant nuclei produced by lattice defects. 
  Reference    Z. Naturforsch. 45a, 481—484 (1990); received August 26 1989 
  Published    1990 
  Keywords    NQR, Lattice imperfections, Magnetic relaxation, Hydrogen bonding 
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 Identifier    ZNA-1990-45a-0481 
 Volume    45 
76Author    Keizo Horiuchi, Takashige Shimizu, Hitomi Iwafune, Tetsuo Asaji, Daiyu NakamuraRequires cookie*
 Title    Temperature Dependences of NQR Frequencies and Nuclear Quadrupole Relaxation Times of Chlorine in 2,6-Lutidinium Hexachlorotellurate (IV) as Studied by Pulsed NQR Techniques  
 Abstract    The temperature dependences of the 35 C1 NQR frequencies v Q and the nuclear quadrupole spin-lattice relaxation times T 1(j in 2,6-lutidinium hexachlorotellurate (IV) was observed at various temperatures between 80 and 343 K. This crystal undergoes a phase transition at T c = 229 K. A single and three pairs of 35 C1 NQR frequencies were observed above and below T c , respectively. The hysteresis of the phase transition and a discontinuity in the temperature dependence of the resonance frequencies at T c indicate that this phase transition is of first order. Although the resonance frequen-cies of the pairs in the low temperature phase are very close to one another, T X g and below T c could be accurately determined by measuring the Fourier transform spectra of each line. Above ca. 250 K, T 1Q showed an exponential decrease which is attributable to the overall reorientational motion of [TeCl 6 ] 2_ with an activation energy of 82 kJ mol" 
  Reference    Z. Naturforsch. 45a, 485—489 (1990); received August 25 1989 
  Published    1990 
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 Identifier    ZNA-1990-45a-0485 
 Volume    45 
77Author    Silvia Wigand, Norbert Weiden, Alarich WeissRequires cookie*
 Title    On the Nature of the "Bleaching out" Process of the 35 C1 NQR Signals in 1,2,3-Trichlorobenzene  
 Abstract    The 35 C1 NQR frequencies, linewidths, and spin-lattice relaxation times T(35 Cl) of 1,2,3-tri-chlorotrideuterobenzene were measured at various temperatures. The deuterated compound shows the same bleaching out phenomenon as 1,2,3-trichlorobenzene. Single crystal 2 H NMR measure-ments were carried out at 295 and 193 K. The nuclear quadrupole coupling constants at room temperature are in the range of 175.8 ^ e 2 qQh~ 1 (2 H)/kHz ^ 179.5, and the asymmetry parameters t] in the range of 0.060 ^ ??(2 H) ^ 0.073. As for the principal axes of the electric field gradient tensor, it was found that <£. Z (2 H) is parallel to the C-D bond, $ (2 H) is perpendicular to the benzene ring plane and 0 XJC (2 H) lies in the ring plane. The linewidths of the 2 H NMR satellites are idependent of temperature. For the undeuterated compound, the temperature dependence of TJ'H) was also measured. The mechanism leading to the bleaching out of the 35 C1 NQR signals is discussed. 
  Reference    Z. Naturforsch. 45a, 490—502 (1990); received October 9 1989 
  Published    1990 
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 Identifier    ZNA-1990-45a-0490 
 Volume    45 
78Author    Norbert Weiden, Alarich Weiss, Gary Wulfsberg\, William Ilsley, Kevin Benner, William WoursterRequires cookie*
 Title    Activation Energies for Fluxional Behavior in Aryl(pentachlorocyclopentadienyl)mercurials, tj l -C s Cl 5 HgR, from 35 C1 NQR Relaxation Times  
 Abstract    Solid-state activation energies for fluxional behavior in three aryl-subsituted (pentachlorocyclo-pentadienyl)phenylmercury compounds RHgC 5 Cl 5 : (pentachlorocyclopentadienyl)(pentamethyl-phenyl)mercury (I, R = C 6 (CH 3) 5 , £ act = 19.3 kJ mol); (pentachlorocyclopentadienyl)(2,4,6-tris-(terf-butyl)phenyl)mercury (II, R = 2,4,6-C 6 H 2 (C(CH 3) 3) 3 , £ acl = 59.5 kJ mol" *); and (pentachloro-cyclopentadienyl)(phenyl)mercury (III, R = C 6 H 5 , £ act = 62.8 kJ mol -1) have beeb obtained from 3 *C1 NQR spin-lattice relaxation-time measurements. II has also been shown to be fluxional in solution by 13 C NMR spectra. II was prepared by an exchange reaction between Hg(C 5 Cl 5) 2 and Hg(2,4,6-C 6 H 2 (C(CH 3) 3) 3) 2 , which reacted readily despite the great steric hindrance present in the latter reagent. 
  Reference    Z. Naturforsch. 45a, 503—510 (1990); received August 25 1989 
  Published    1990 
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 Identifier    ZNA-1990-45a-0503 
 Volume    45 
79Author    J. Ramakrishna, Norbert Weiden, Alarich WeissRequires cookie*
 Title    Nuclear Quadrupole Coupling Tensors of 2 H in the a-Alum RbAl(S0 4 ) 2 * 12D 2 0 and the Dynamical Behaviour of the D 2 0 Molecules. An Investigation by NMR and IR  
 Abstract    By single crystal NMR the nuclear quadrupole coupling constants eQ<t>,.h~ l (2 H), the asymme-try parameters >/(2 H) and the dircetion cosines of the principal axes of the electric field gradient tensors of the 2 H atoms of the two kinds of D 2 0 molecules have been determined at 295 K in RbAl(S0 4) 2 • 12D 2 0. The results show that the D 2 0 molecules surrounding the ion Al 3+ are "static" within the time scale of the 2 H nuclear quadrupole interaction while the D 2 0 belonging to the octahedron around the Rb + undergoes fast reorientations around the twofold molecular axis. For the two kinds of D 2 0 in the alum we found: eQQlVh' 1 (2 H) = 186.5 kHz, >7 (1, (2 H) = 0.1234; e Q^zV/J~ 1 (2 H) = 169.7 kHz, T7 (2) (2 H) = 0.1297; eQ<t>?fh~ X (2 H) = 122.1 kHz, (2 H) = 0.8087. eQ&iV and eQ<P {2 z belong to the "static" D 2 0 molecules and an assignment to the two different 2 H atoms has been performed. The IR spectra of RbAl(S0 4) 2 • 12(H t _ ;c D ;< .) 2 0 have been investi-gated, and for the O-D stretching frequencies values of 2145 cm" 1 , 2235 cm" 1 , 2470 cm" 1 and 2525 cm 1 have been obtained. They agree well with the relations between v OD and eQ<P,.h' 1 (2 H) given in the literature. 
  Reference    Z. Naturforsch. 45a, 511—518 (1990); received August 21 1989 
  Published    1990 
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 Identifier    ZNA-1990-45a-0511 
 Volume    45 
80Author    Takasuke Matsuo, Masako Sekii, Hiroshi Suga, Nobuo Nakamura, Hideaki ChiharaRequires cookie*
 Title    C1 NQR Study of Guest Dynamics in Thiourea-CCl 4 Inclusion Complex  
 Abstract    35 C1 nuclear quadrupole resonance measurements on thiourea-CCl 4 inclusion complex yielded two resonance lines with intensity ratio 1:3. This indicates that the guest CC1 4 molecule occupies the three-fold symmetry site in the channel formed by the thiourea framework. The resonance frequencies closely follow Bayer's equation between 4.2 K and 27 K. At higher temperatures the resonance lines faded out. This is attributed to the onset of reorientation of the CC1 4 molecule. The activation energy for this motion was estimated to be 6 kJ mol -1 . 
  Reference    Z. Naturforsch. 45a, 519—522 (1990); received August 23 1989 in revised form December 5 1989 
  Published    1990 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0519.pdf 
 Identifier    ZNA-1990-45a-0519 
 Volume    45 
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