Non-Fermi Liquid Behavior in the Magnetotransport of CeMIn_5 (M: Co and Rh) : Striking Similarity between Quasi Two-Dimensional Heavy Fermion and High-T_c Cuprates(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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We present a systematic study of the de-resistivity, Hall effect, and magnetoresistance in the normal state of quasi two-dimensional (2D) heavy fermion superconductors CeMIn_5 (M: Rh and Co) under pressure. Here the electronic system evolves with pressure from an antiferromagnetic (AF) metal, through a highly unconventional non-Fermi liquid, and finally into a Fermi-liquid state. The novelty of these materials is best highlighted when compared with LaMIn_5, a system with similar electronic structures, which shows a nearly temperature independent Hall coefficient and a magnetoresisitance which is well described by the classical Kohler's rule. In sharp contrast, in CeMIn_5, the amplitude of the Hall coefficient increases dramatically with decreasing temperature, reaching at low temperatures a value significantly larger than 1/ne, where n is the carrier number. Furthermore, the magnetoresistance is characterized by T- and H-dependence which clearly violate Kohler's rule. We found that the cotangent of the Hall angle cot⊝_H varies as T^2, and the magnetoresistance is well scaled by the Hall angle as Δρ_<xx>/ρ_<xx> oc tan^2 cot⊝_H. These non-Fermi liquid properties in the electron transport are remarkably pronounced when the AF fluctuations are enhanced in the vicinity of the quantum critical point. We lay particular emphasis on the striking resemblance of these anomalous magnetotransport with those of the high-T_c cuprates. We argue that features commonly observed in quasi 2D heavy fermion and cuprates very likely capture universal features of strongly correlated electron systems in the presence of strong AF fluctuations, holding the promise of bridging our understanding of heavy fermion systems and high-T_c cuprates.
- 社団法人日本物理学会の論文
- 2007-02-15
著者
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Settai R.
Nara Medical University Center For Infectious Diseases
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SUEMATSU Hisayuki
Extreme Energy-Density Research Institute, Nagaoka University of Technology
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Mito T
National Institute Of Material Science
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Onuki Yoshichika
Institute Of Materials Science The University Of Tsukuba
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Behnia K.
Laboratoire De Physique Quantique (cnrs)
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Izawa Koichi
Department Of Physics Faculty Of Science Hiroshima University
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Suematsu Hisayuki
Extreme Energy-density Research Institute Nagaoka University Of Technology
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Settai R.
Graduate School of Science, Osaka Univ.
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Onuki Y.
Graduate School of Science, Osaka University
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HEDO M.
Institute for Solid State Physics, University of Tokyo
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UWATOKO Y.
Institute for Solid State Physics, University of Tokyo
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Hedo M.
Institute For Solid State Physics University Of Tokyo
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Uwatoko Y.
Inst. Of Solid State Physics Tokyo Univ.
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Settai R
Research Institute For Scientific Measurements Tohoku University
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MATSUMOTO T.
The JSC Surveillance Committee Japanese Society of Chemotherapy
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MATSUDA Y.
Department of Pediatrics, Faculty of Medicine, Kagoshima University
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SHISHIDO H.
Department of Physics, Graduate School of Science, Osaka University
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Izawa K
Institute For Solid State Physics University Of Tokyo:cea-grenoble
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NAKAJIMA Y.
Department of Physiscs, Kyoto University
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NAKAI H.
Department of Physiscs, Kyoto University
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SHIBAUCHI T.
Department of Physiscs, Kyoto University
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IZAWA K.
Institute for Solid State Physics, University of Tokyo
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MATSUMOTO T.
National Institute of Material Science
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KONTANI H.
Department of Physics, Nagoya University
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Kontani H
Department Of Physics Nagoya University
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Shibauchi T.
Department Of Applied Physics The University Of Tokyo
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Mito Takeshi
National Institute Of Material Science
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Mito Takeshi
Department Of Physical Science Graduate School Of Engineering Science Osaka University
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Suematsu Hisayuki
Extreme Energy-density Res. Inst. Nagaoka Univ. Of Technol.
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Uwatoko Y.
Institute For Solid State Physics University Of Tokyo
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Shishido H
Extreme Energy-density Research Institute Nagaoka University Of Technology
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Onuki Y
Graduate School Of Science Osaka Univ.
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Kontani H.
Department Of Pharmacology Faculty Of Pharmaceutical Science Hokuriku University
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Onuki Y.
Advanced Science Research Center Jaea:graduate School Of Science Osaka Univ.
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Onuki Y.
Graduate School Of Science Osaka Univ.
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Shishido H.
Department of Physics and Electronics, Osaka Prefecture University:Institute for Nanofabrication Research, Osaka Prefecture University
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Shishido H.
Department of Physics and Electronics, Osaka Pref. Univ.
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Uwatoko Y.
Institute for Solid State Physice, University of Tokyo
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