Physics – Condensed Matter – Superconductivity
Scientific paper
2004-05-20
Physics
Condensed Matter
Superconductivity
4 pages with 4 figures. Accepted for publication in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.93.027003
We report on novel antiferromagnetic (AFM) and superconducting (SC) properties of noncentrosymmetric CePt3Si through measurements of the 195Pt nuclear spin-lattice relaxation rate 1/T_1. 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 T^3 law that used to be reported for most unconventional HF superconductors. We remark that this unexpected SC characteristics may be related with the lack of an inversion center in its crystal structure.
Bauer Eckhard
Haga Yoshinori
Hashimoto Shigehira
Kitaoka Yoshio
Matsuda Tatsuma D.
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