Pressure-Induced Localization of 4f Electrons in the Intermediate Valence Compound SmB
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概要
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We report high-pressure studies of X-ray diffraction and <sup>11</sup>B-nuclear magnetic resonance (NMR) in the intermediate-valence compound SmB<inf>6</inf>. The pressure dependence of the lattice constant was precisely determined and no anomaly was observed up to 9.1 GPa. The temperature dependence of the nuclear quadrupole resonance frequency \nu_{\text{Q}}, obtained from the <sup>11</sup>B-NMR measurements, is predominantly contributed by on-site charge distribution. Using the relationship between \nu_{\text{Q}} and Sm valence at ambient pressure reported previously, we estimate the pressure dependence of the Sm valence up to 6 GPa as well. The increase in the Sm valence accelerates with pressure and reaches an increase of about 10% at 6 GPa. The pressure-induced localization of Sm 4f-holes may be responsible for the long-range magnetic order under pressure.
- 2013-12-15
著者
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Reiffers Marian
Institute Of Experimental Physics Slovak Academy Of Sciences
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Kohara Takao
Graduate School Of Material Science University Of Hyogo
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Takeshita Nao
National Institute Of Advanced Industrial Science And Technology
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FUKAZAWA Hideto
Graduate School of Science and Technology, Chiba University
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Flachbart Karol
Institute Of Experimental Physics Slovak Academy Of Sciences
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Akahama Yuichi
Graduate School Of Material Science University Of Hyogo
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Ueda Koichi
Graduate School Of Life Science University Of Hyogo
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Kohori Yoh
Graduate School Of Engineering Science Osaka University
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KOYAMA Takehide
Graduate School of Material Science, University of Hyogo
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Mito Takeshi
Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
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Hara Yukiko
Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
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Flachbart Karol
Institute of Experimental Physics, Slovak Academy of Science, 04001 Kosice, Slovakia
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Nishiyama Kohei
Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
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Pristáš Gabriel
Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
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Gabáni Slavomír
Institute of Experimental Physics, Slovak Academy of Science, 04001 Kosice, Slovakia
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Shitsevalova Natalia
Institute for Problem of Material Science, National Academy of Science of Ukraine, 03680 Kiev, Ukraine
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Kohori Yoh
Graduate School of Science, Chiba University, Chiba 263-8522, Japan
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Gabáni Slavomír
Institute of Experimental Physics, Slovak Academy of Science, 04001 Kosice, Slovakia
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