Anomalously Field-Insensitive Correlated Electron Behaviors in SmTa
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概要
- 論文の詳細を見る
The low-temperature properties of single crystals of SmTa<inf>2</inf>Al<inf>20</inf>have been studied by electrical resistivity, magnetization, and specific heat measurements. A \lambda-type peak structure, indicating a phase transition, was found in the specific heat at T_{\text{x}} = 2.0 K. From an analysis of the nuclear specific heat contribution, the ordered moment is estimated to be 0.22 \mu_{\text{B}}/Sm, which is largely suppressed from 0.84 \mu_{\text{B}}/Sm for a free Sm<sup>3+</sup>ion. The Kondo-like -{\log T} dependence of resistivity and the suppressed effective magnetic moment of 0.09 \mu_{\text{B}}/Sm above T_{\text{x}} indicate strong c--f hybridization. The largely enhanced specific heat divided by temperature of about 3 J/(mol K<sup>2</sup>) below 0.4 K suggests the formation of extremely heavy quasiparticles in the ordered state. A notable feature commonly observed in all of these behaviors is robustness against magnetic fields. We discuss the possible relevance of multipole moments in the quartet ground state to the robustness against magnetic fields.
- 2013-12-15
著者
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Yamada Akira
Department Of Cardiology Aso-iizuka Hospital
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Aoki Yuji
Department Of Chemistry Faculty Of Science Gakushuin University
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Matsuda Tatsuma
Department Of Physics Tokyo Metropolitan University
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Harima Hisatomo
Department Of Condensed Matter Physics The Institute Of Scientific And Industrial Research Osaka Uni
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Fujita Wataru
Department Of Applied Chemistry School Of Engineering Nagoya University
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Miyazaki Ryoichi
Department Of Internal Medicine Fujita Memorial Hospital
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Higashinaka Ryuji
Department Of Physics Kyoto University
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Sato Hideyuki
Department Of Applied Chemistry Faculty Of Science And Technology Keio University
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Aoki Yuji
Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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Harima Hisatomo
Department of Physics, Kobe University, Kobe 657-8501, Japan
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Fujita Wataru
Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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Fushiya Kengo
Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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Matsuda Tatsuma
Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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