ZfN: Search Results

1	Author	E. A. Kravchenko, V. G. Orlov	Requires cookie*
	Title	Local Magnetic Fields in some Bismuth Compounds. A Survey of Experimental Evidences
	Abstract	The splittings observed in the 209Bi nuclear quadrupole resonances of a-Bi?0 3, in zero magnetic field, follow the typical pattern of a Zeeman perturbed N Q R spectrum. The lineshapes in Bi30 4Br also indicate a poorly resolved splitting that points to the presence of an internal magnetic field in the order of 200 G. This exceeds notably the dipole nuclear magnetic fields (about several G), but is orders of magnitude smaller than paramagnetic fields produced by unpaired electron spins. The results obtained using a S Q U ID and ^SR-technique can also be interpreted as indicative of magnetic properties not conventionally expected in such compounds.
	Reference	Z. Naturforsch. 49a, 418—424 (1994); received December 15 1993
	Published	1994
	Keywords	209Bi N Q R, Internal magnetic field, Lineshape, SQ U ID, \|iSR
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	TEI-XML for	default:Reihe_A/49/ZNA-1994-49a-0418.pdf
	Identifier	ZNA-1994-49a-0418
	Volume	49

2	Author	N. E. Ainbinderl, G. A. Volgina, E. A. Kravchenko, A. N. Osipenko, \.A A Gippius, SuanHai Fam, A. A. Bush3	Requires cookie*
	Title	209Bi N Q R Powder Spectra Influenced by Local and Applied Magnetic Fields
	Abstract	Several experimental techniques have shown evidence for the existence of internal magnetic fields of the order of 200 G in oc-Bi20 3 [1]. The asymmetrical 209Bi N Q R lineshapes in Bi30 4Br also point to a source of poorly resolved splitting present in this compound. In order to obtain further insight into the origin of the local magnetic fields in these compounds the 209Bi N Q R lineshapes of polycrystalline a-Bi20 3 and Bi30 4Br were recorded in weak (below 500 G) static magnetic fields. A calculation of the expected powder lineshapes in a-Bi20 3 under the influence of the internal and applied magnetic fields up to 1 kG was made. The results of the computer simulation are compared with the lineshapes recorded. From the 209Bi lineshapes ob served in the experiment, the local magnetic field at one of the two Bi-sites in Bi30 4Br was estimated.
	Reference	Z. Naturforsch. 49a, 425—432 (1994); received December 15 1993
	Published	1994
	Keywords	209Bi N Q R, Internal magnetic field, Lineshape, Applied magnetic field, Computer simulation
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	TEI-XML for	default:Reihe_A/49/ZNA-1994-49a-0425.pdf
	Identifier	ZNA-1994-49a-0425
	Volume	49

3	Author	E. A. Kravchenko, V. G. Orlov, SuanHai Fam, YuF. Kargin	Requires cookie*
	Title	Bi NQR and Magnetic Properties of Bismuth Oxide-Based Compounds
	Abstract	The NQR line shapes of 209 Bi in the a-Bi 2 0 3 -based mixed oxides Bi 2 0 3 • 2M 2 0 3 (M = Al, Ga). Bi 2 0 3 • 3Ge0 2 , and 2Bi 2 0 3 • 3Ge0 2 are recorded in zero and weak magnetic fields (// ext < 500 Oe) and compared with the results of computer simulation. Splittings and line shape asymmetry, exhibited by the resonances, suggest that internal magnetic fields, similar to those earlier reported for a-Bi 2 0 3 and Bi 3 0 4 Br, may exist in these compounds. In the spectra of single crystal Bi 4 Ge 3 0 12 , the line multiplicity in external magnetic fields is higher than simulated, which might results from domains in the crystal. In external magnetic fields a notable increase in the line intensity was observed, the effect depend-ing on the mutual orientation of the EFG axes and the fields perturbing the nuclear spin system.
	Reference	Z. Naturforsch. 53a, 504—513 (1998); received January 26 1998
	Published	1998
	Keywords	209 Bi NQR, Internal Magnetic Field, Line Shape, Applied Magnetic Field, Computer Simulation
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	TEI-XML for	default:Reihe_A/53/ZNA-1998-53a-0504.pdf
	Identifier	ZNA-1998-53a-0504
	Volume	53