Local ordered magnetic fields in bismuth dielectrics. 209Bi NQR in Bi4Ge3O12 single crystal |
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| Institution: | 1. Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky pr. 31, Moscow 117907, Russia;2. Russian Research Center ‘Kurchatov Institute’, Kurchatov sq. 1, Moscow 123182, Russia;3. Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan;1. Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, China;2. Joint Institute for Nuclear Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA;3. Idaho National Laboratory, Idaho Falls, ID 83415, USA;4. Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China;5. Institute of Modern Physics, Chinese Academy of Science, Lanzhou, Gansu 730000, China;1. Department of Chemistry, University of Wisconsin - Eau Claire, Eau Claire, WI 54702, United States;2. Department of Chemistry and Biochemistry, University of Montana, Missoula, MT 59812, United States;1. Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China;2. Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA;3. F.M. Kirby Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, MD, USA;1. Instituto de Física, Universidade Federal de Goiás, Goiânia, GO, Brazil;2. Department of Physics, Gandhi Institute of Technology and Management University (GITAM), Bengaluru, Karnataka, India |
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| Abstract: | The results of the 209Bi NQR experiments carried out on α-Bi2O3, Bi3O4Br, Bi2M4O9 (M=Al, Ga), Bi2Ge3O9, and Bi4Ge3O12 showed that these compounds are not diamagnets in the conventional sense. The Zeeman perturbed zero-field 209Bi NQR spectra gave an indication that local ordered magnetic fields of the order of 30–200 G exist in these substances comprising neither transition nor rare earth elements. Further aspects of this principally new phenomenon of yet unknown nature were studied by the 209Bi NQR experiments on the Bi4Ge3O12 single crystal in external magnetic fields below 500 Oe, applied at various orientations with respect to the crystal axes. The spectral patterns of dramatically increased intensity and multiplicity, caused by the unknown magnetism of the compound, were observed in applied fields and modeled. Based on the results of the modeling, the conclusions were made that at least four magnetically non-equivalent Bi sites characterized by antiferromagnetically ordered local fields of the order of 30 G are present in the Bi4Ge3O12 crystal; the intensity increase was interpreted to arise from the change in orientation of the electric field gradient axes at the Bi site upon applying an external magnetic field. |
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