Metal-Insulator Transition in Pyrochlore Iridates Ln_2Ir_2O_7 (Ln=Nd, Sm, and Eu)(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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We report that Ln_2Ir_2O_7 for Ln=Nd, Sm, and Eu have metal-insulator transitions (MITs) at 36, 117, and 120K, respectively. Their electrical resistivities and thermoelectric powers are not discontinuous and exhibit no thermal hysteresis at their transition temperatures T_<MI>, indicating second-order phase transitions. In this letter, we focus on the MIT of Sm_2Ir_2O_7. The specific heat and the magnetic susceptibility show a clear anomaly at T_<MI>. These results indicate that this MIT involves a magnetic ordering produced by 5d electrons in Ir.
- 社団法人日本物理学会の論文
- 2007-04-15
著者
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Wakeshima Makoto
Division Of Chemistry Graduate School Of Science Hokkaido University
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松平 和之
九州工業大学工学部 電気工学科
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Hinatsu Yukio
Division Of Chemistry Graduate School Of Science Hokkaido University
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TAKAGI Seishi
Faculty of Engineering, Kyushu Institute of Technology
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MATSUHIRA Kazuyuki
Faculty of Engineering, Kyushu Institute of Technology
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NAKANISHI Ryo
Faculty of Engineering, Kyushu Institute of Technology
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YAMADA Takaaki
Faculty of Engineering, Kyushu Institute of Technology
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NAKAMURA Akira
Faculty of Engineering, Kyushu Institute of Technology
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KAWANO Wataru
Faculty of Engineering, Kyushu Institute of Technology
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Maezawa K
Toyama Prefectural Univ. Toyama
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Matsuda Kyoko
Department Of Material Physics Graduate School Of Engineering Science Osaka University
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Nakanishi Ryo
Faculty Of Engineering Kyushu Institute Of Technology
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Matsushita Kazuyuki
Division Of Physics Graduate School Of Science Hokkaido University
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Kawano Wataru
Faculty Of Engineering Kyushu Institute Of Technology
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Yamada Takaaki
Faculty Of Engineering Kyushu Institute Of Technology
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Nakamura Akira
Faculty Of Engineering Kyushu Institute Of Technology
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