Evidence for a novel state of superconductivity in noncentrosymmetric CePt3Si:: A 195Pt-NMR study -: art. no. 027003

被引:142
作者
Yogi, M [1 ]
Kitaoka, Y
Hashimoto, S
Yasuda, T
Settai, R
Matsuda, TD
Haga, Y
Onuki, Y
Rogl, P
Bauer, E
机构
[1] Osaka Univ, Grad Sch Engn Sci, Dept Mat Engn Sci, Osaka 5608531, Japan
[2] Osaka Univ, Grad Sch Sci, Osaka 5600043, Japan
[3] Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan
[4] Univ Vienna, Inst Phys Chem, A-1090 Vienna, Austria
[5] Vienna Univ Technol, Inst Festkorperphys, A-1040 Vienna, Austria
基金
日本学术振兴会; 奥地利科学基金会;
关键词
D O I
10.1103/PhysRevLett.93.027003
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report on novel antiferromagnetic (AFM) and superconducting (SC) properties of noncentrosymmetric CePt3Si through measurements of the Pt-195 nuclear spin-lattice relaxation rate 1/T-1. In the normal state, the temperature (T) dependence of 1/T-1 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 T-N=2.2 K and T-c=0.75 K, respectively, takes place on a microscopic level. CePt3Si is the first HF superconductor that reveals a peak in 1/T-1 just below T-c and, additionally, does not follow the T-3 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.
引用
收藏
页码:027003 / 1
页数:4
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