Evidence for Unconventional Superconducting Fluctuations in Heavy-Fermion Compound CeNi_2Ge_2(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We present evidence for unconventional superconducting fluctuations in a heavy-fermion compound CeNi_2Ge_2. The temperature dependence of the ^<73>Ge nuclear-spin-lattice-relaxation rate 1/T_1 indicates the development of magnetic correlations and the formation of a Fermi-liquid state at temperatures lower than T_<FL>=0.4K, where 1/T_1T is constant. The resistance and 1/T_1T measured on an as-grown sample decrease below T^<onset>_c=0.2K and T^<NQR>_c=0.1K, respectively; these are indicative of the onset of superconductivity. However, after annealing the sample to improve its quality, these superconducting signatures disappear. These results are consistent with the emergence of unconventional superconducting fluctuations in close proximity to a quantum critical point from the superconducting to the normal phase in CeNi_2Ge_2.
- 社団法人日本物理学会の論文
- 2006-04-15
著者
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KOBAYASHI Yoshio
Nishina Center for Accelerator Based Science
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Kawasaki S.
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
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Mito T
National Institute Of Material Science
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Haller E.
Department Of Materials Science And Engineering University Of California At Berkeley And Lawrence Be
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Kitaoka Y.
Graduate School Of Science Osaka University
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Kitaoka Yoshio
Graduate School Of Engineering Science Osaka University
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Kobayashi T.
Department of Obstetrics and Gynecology, Hamamatsu University School of Medicine
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Kitaoka Y.
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
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Koike Yoshihiro
Advanced Science Research Center Japan Atomic Energy Research Institute
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SADA T.
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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MIYOSHI T.
Department of Physics, Faculty of Science, Okayama University
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KOTEGAWA H.
Department of Physics, Faculty of Science, Okayama University
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MUKUDA H.
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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FUKUHARA T.
Faculty of Engineering, Toyama Prefectural University
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MAEZAWA K.
Faculty of Engineering, Toyama Prefectural University
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ITOH K.
Department of Applied Physics and Physico-Informatics, Keio University
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Kawasaki Y
Department Of Quantum Materials Science University Of Tokushima
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Kontani H
Department Of Physics Nagoya University
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Kitaoka Y
Osaka Univ. Osaka Jpn
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Kobayashi T.
Department Of Obstetrics And Gynecology Hamamatsu University Of Medicine
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Mito Takeshi
Department Of Physical Science Graduate School Of Engineering Science Osaka University
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Maezawa K.
Faculty Of Engineering Toyama Prefectural University
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Mukuda H.
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
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Kitaoka Y.
Department Of Material Physics Osaka University Toyonaka-shi Osaka 560 Japan
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Kobayashi T.
Department Of Internal Medicine Tokyo University Branch Hospital
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SADA T.
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
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MUKUDA H.
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
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Kotegawa H.
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531
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