Evidence for Uniform Coexistence of Ferromagnetism and Unconventional Superconductivity in UGe_2 : A ^<73>Ge-NQR Study under Pressure(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We report on the itinerant ferromagnetic superconductor UGe_2 through ^<73>Ge-NQR measurements under pressure (P). The P dependence of the NQR spectrum signals a first-order transition from the low-temperature (T) and low-P ferromagnetic phase (FM2) to high-T and high-P one (FM1) around a critical pressure of P_x∿1.2GPa. The superconductivity exhibiting a maximum value of T_<sc>=0.7K at P_x∿1.2GPa, was found to take place in connection with the P-induced first-order transition. The nuclear spin-lattice relaxation rate 1/T_1 has probed the ferromagnetic transition, exhibiting a peak at the Curie temperature as well as a decrease without the coherence peak below T_<sc>. These results reveal the uniformly coexistent phase of ferromagnetism and unconventional superconductivity with a line-node gap. We remark on an intimate interplay between the onset of superconductivity and the underlying electronic state for the ferromagnetic phases.
- 一般社団法人日本物理学会の論文
- 2005-02-15
著者
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Kawasaki S.
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
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Haller E.
Department Of Materials Science And Engineering University Of California At Berkeley And Lawrence Be
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Yamamoto E.
Advanced Science Research Center, JAEA
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ITOH K.
Department of Applied Physics and Physico-Informatics, Keio University
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HARADA A.
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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KAWASAKI Y.
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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Haga Y.
Advanced Science Research Center Jaea
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Onuki Y.
Advanced Science Research Center Jaea:graduate School Of Science Osaka Univ.
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Kitaoka Y.
Department Of Material Physics Osaka University Toyonaka-shi Osaka 560 Japan
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Harima H.
Department Of Physics Faculty Of Science Kobe Univ.
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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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