[Zurück]

M. Yogi, H. Mukuda, Y. Kitaoka, S. Hashimoto, T. Yasuda, R. Settai, T.D. Matsuda, Y. Haga, Y. Onuki, P. Rogl, E. Bauer:
"Evidence for Novel Pairing State in Noncentrosymmetric Superconductor CePt₃Si: ²⁹Si-NMR Knight Shift Study";
Journal of the Physical Society of Japan, 75 (2006), 1; S. 013709-1 - 013709-4.

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

Mamoru Yogi*, Hidekazu Mukuda, Yoshio Kitaoka, Shin Hashimoto 1, Takashi Yasuda 1, Rikio Settai 1, Tatsuma D. Matsuda 2, Yoshinori Haga 2, Yoshichika Onuki 1,2, Peter Rogl 3 and Ernst Bauer 4

Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Osaka 560-8531
1 Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
2 Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195
3 Institut für Physikalische Chemie, Universität Wien, A-1090 Wien, Austria
4 Institut 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 ²⁹Si Knight shift ²⁹K on the noncentrosymmetric heavy-fermion compound CePt₃Si in which antiferromagnetism (AFM) with T_N=2.2 K coexists with superconductivity (SC) with T_c=0.75 K. Its spin part ²⁹Ks, 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 ¹⁹⁵Pt 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 CePt₃Si.

KEYWORDS: heavy-fermion superconductivity, CePt₃Si, NMR, Knight shift, Cooper pairing symmetry

*Present address: Faculty of Science, University of the Ryukyus, Okinawa 903-0213. E-mail: myogi@sci.u-ryukyu.ac.jp

heavy-fermion superconductivity, CePt₃Si, NMR, Knight shift, Cooper pairing symmetry

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06588056

http://dx.doi.org/10.1143/JPSJ.75.013709