J. Phys. Soc. Jpn. 75, 013709 (2006) [4 Pages]
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LETTERS

Evidence for Novel Pairing State in Noncentrosymmetric Superconductor CePt3Si: 29Si-NMR Knight Shift Study

Mamoru Yogi1, Hidekazu Mukuda1, Yoshio Kitaoka1, Shin Hashimoto2, Takashi Yasuda2, Rikio Settai2, Tatsuma D. Matsuda3, Yoshinori Haga3, Yoshichika Ōnuki2,3, Peter Rogl4, and Ernst Bauer5
+ Affiliations
1Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Osaka 560-85312Graduate School of Science, Osaka University, Toyonaka, Osaka 560-00433Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-11954Institut für Physikalische Chemie, Universität Wien, A-1090 Wien, Austria5Institut für Festkörperphysik, Technische Universität Wien, A-1040 Wien, Austria
Received September 2, 2005; Accepted November 9, 2005; Published January 10, 2006

We report the measurements of the 29 Si Knight shift 29 K on the noncentrosymmetric heavy-fermion compound CePt 3 Si in which antiferromagnetism (AFM) with T N =2.2 K coexists with superconductivity (SC) with T c =0.75 K. Its spin part 29 K s , which is deduced to be K s c ≥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 3 Si.

©2006 The Physical Society of Japan
https://doi.org/10.1143/JPSJ.75.013709
KEYWORDS: heavy-fermion superconductivity, CePt3Si, NMR, Knight shift, Cooper pairing symmetry

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