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1994 (2)
1Author    E. A. Kravchenko, V. G. OrlovRequires 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 
2Author    N. E. Ainbinderl, G. A. Volgina, E. A. Kravchenko, A. N. Osipenko, \.A A Gippius, SuanHai Fam, A. A. Bush3Requires 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