Pressure-Induced Localization of 4f Electrons in the Intermediate Valence Compound SmB sub( 6)

We report high-pressure studies of X-ray diffraction and 11B-nuclear magnetic resonance (NMR) in the intermediate-valence compound SmB6. 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 quadr...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2013-02, Vol.82 (12), p.1-1
Main Authors: Nishiyama, Kohei, Mito, Takeshi, Pristas, Gabriel, Hara, Yukiko, Koyama, Takehide, Ueda, Koichi, Kohara, Takao, Akahama, Yuichi, Gabani, Slavomir, Reiffers, Marian, Flachbart, Karol, Fukazawa, Hideto, Kohori, Yoh, Takeshita, Nao, Shitsevalova, Natalia
Format: Article
Language:English
Subjects:
Diffraction
Estimates
Lattice parameters
Localization
Position (location)
Pressure dependence
Temperature dependence
X-rays
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Summary:We report high-pressure studies of X-ray diffraction and 11B-nuclear magnetic resonance (NMR) in the intermediate-valence compound SmB6. 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 vQ, obtained from the 11B-NMR measurements, is predominantly contributed by on-site charge distribution. Using the relationship between vQ 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.
ISSN:0031-9015
1347-4073