Publications in Scientific Journals:

M. Yogi, Y. Kitaoka, S. Hashimoto, T. Yasuda, R. Settai, T.D. Matsuda, Y. Haga, Y. Önuki, P. Rogl, E. Bauer:
"Evidence for a Novel State of Superconductivity in Noncentrosymmetric CePt3Si: A 195Pt-NMR Study";
Physical Review Letters, Vol. 93 (2004), No. 2; 027003-1 - 027003-4.

English abstract:
Evidence for a Novel State of Superconductivity in Noncentrosymmetric CePt3Si: A 195Pt-NMR Study

M. Yogi,1 Y. Kitaoka,1 S. Hashimoto,2 T. Yasuda,2 R. Settai,2 T. D. Matsuda,3 Y. Haga,3 Y. Onuki,2,3 P. Rogl,4 and E. Bauer5
1Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan
2Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
3Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
4Institut für Physikalische Chemie, Universität Wien, A-1090 Wien, Austria
5Institut für Festkörperphysik, Technische Universität Wien, A-1040 Wien, Austria

(Received 2 March 2004; published 8 July 2004)

We report on novel antiferromagnetic (AFM) and superconducting (SC) properties of noncentrosymmetric CePt3Si through measurements of the 195Pt nuclear spin-lattice relaxation rate 1/T1. In the normal state, the temperature (T) dependence of 1/T1 unraveled the existence of low-lying levels in crystal-electric-field multiplets and the formation of a heavy-fermion (HF) state. The coexistence of AFM and SC phases that emerge at TN = 2.2 K and Tc = 0.75 K, respectively, takes place on a microscopic level. CePt3Si is the first HF superconductor that reveals a peak in 1/T1 just below Tc and, additionally, does not follow the T3 law that used to be reported for most unconventional HF superconductors. We remark that this unexpected SC characteristic may be related to the lack of an inversion center in its crystal structure. 2004 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v93/e027003
PACS: 74.70.Tx, 71.27.+a, 74.25.Ha, 76.60.-k

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