Evidence for Novel Pairing State in Noncentrosymmetric Superconductor CePt_3Si : ^<29>Si-NMR Knight Shift Study(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We report the measurements of the ^<29>Si Knight shift ^<29>K on the noncentrosymmetric heavy-fermion compound CePt_3Si in which antiferromagnetism (AFM) with T_N=2.2K coexists with superconductivity (SC) with T_c=0.75K. Its spin part ^<29>K_s, which is deduced to be K^c_s≥0.11 and 0.16% at respective magnetic fields H=2.0061 and 0.8671 T, does not decrease across the superconducting transition temperature T_c for the field along the c-axis. The temperature dependence of nuclear spin-lattice relaxation of ^<195>Pt below T_c has been accounted for by a Cooper pairing model with a two-component order parameter composed of spin-singlet and spin-triplet pairing components. From this result, it is shown that the Knight-shift data are consistent with the occurrence of the two-component order parameter for CePt_3Si.
- 2006-01-15
著者
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SETTAI Rikio
Graduate School of Science, Osaka University
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Yogi Mamoru
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University:
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Bauer Ernst
Institute Of Solid State Physics Vienna University Of Technology
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HASHIMOTO Shin
Graduate School of Science, Osaka University
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Kitaoka Yoshio
Department Of Material Physics Faculty Of Engineering Science Osaka University
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ROGL Peter
Institut fur Physikalische Chemie der Universitat Wien
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Onuki Yoshichika
Graduate School Of Science Osaka University
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Mukuda Hidekazu
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
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MATSUDA Tatsuma
Advance Science Research Center, Japan Atomic Energy Agency
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HAGA Yoshinori
Advance Science Research Center, Japan Atomic Energy Agency
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Yasuda Takashi
Graduate School of Computer Science and Systems Engineering, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, Fukuoka 820-8502, Japan
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