Analysis of ^<11>B NMR Powder Lineshape of MgB_2 in the Normal Conductive Phase(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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^<11>B nuclear magnetic resonance (NMR) measurements have been performed on MgB_2 powder sample at several magnetic fields ranging from 6.3 to 21.9 T. The isotropic Knight-shift, as well as quadrupole coupling frequency, was accurately determined from magic-angle spinning (MAS) spectra by analyzing its magnetic-field dependence. These NMR parameters were then used to interpret its static powder-pattern spectra observed at various magnetic fields, which reflect both the anisotropic Knight-shift tensor and the second-order quadrupole coupling tensor. We found that the Knight-shift tensor and the quadrupole coupling are both axially symmetric and their relative orientation to the molecular frame was also determined. This is the first experimental determination of the anisotropy of the Knight-shift of MgB_2 in a powder form from an exact analysis of the powder lineshape of the ^<11>B NMR spectra. The anisotropy was found to be very small (〜4ppm), being in consistent with previous observations indicating that anisotropy of electronic conductivity in MgB_2 is small.
- 社団法人日本物理学会の論文
- 2008-04-15
著者
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MURAKAMI Miwa
Advanced Nano Characterization Center, National Institute for Materials Science
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SHIMIZU Tadashi
Advanced Nano Characterization Center, National Institute for Materials Science
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TAKEGOSHI Kiyonori
Department of Chemistry, Graduate School of Science, Kyoto University
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Takegoshi Kiyonori
Department Of Chemistry Graduate School Of Science Kyoto University:crest Japan Science And Technolo
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SHIMIZU Tadashi
National Research Institute for Metals
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Murakami Miwa
Advanced Nano Characterization Center National Institute For Materials Science
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SHIMIZU Tadashi
Institute for Solid State Physics,University of Tokyo
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Shimizu Tadashi
Advanced Nano Characterization Center National Institute For Materials Science
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Shimizu T
National Inst. Materials Sci. Ibaraki Jpn
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YAMAJI Toshiki
Department of Chemistry, Graduate School of Science, Kyoto University
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Yamaji Toshiki
Department Of Chemistry Graduate School Of Science Kyoto University
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Yamaji Toshiki
Department Of Chemistry Graduate School Of Science Kyoto University:crest Japan Science And Technolo
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FUKAZAWA Jun
Department of Chemistry, Graduate School of Science, Kyoto University
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Fukazawa Jun
Department Of Chemistry Graduate School Of Science Kyoto University
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Shimizu T
National Research Laboratory For Metal
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Shimizu Tadashi
High-field Nmr Group Advanced Nano Characterization Center
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Shimizu Tadashi
Issp Of The Univercity Of Tokyo
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Takegoshi Kiyonori
Department Of Chemistry Graduate School Of Science Kyoto University
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Shimizu Tadashi
National Institute For Material Sciences
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Shimizu Tadashi
National Institute For Material Science
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