Yogi M, Kitaoka Y, Hashimoto S, Yasuda T, Settai R, Matsuda T D, Haga Y, Onuki Y, Rogl P, Bauer E
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan.
Phys Rev Lett. 2004 Jul 9;93(2):027003. doi: 10.1103/PhysRevLett.93.027003. Epub 2004 Jul 8.
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/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 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.
我们通过测量¹⁹⁵Pt核自旋 - 晶格弛豫率1/T(1)，报道了非中心对称CePt₃Si的新型反铁磁（AFM）和超导（SC）特性。在正常态下，1/T(1)对温度（T）的依赖性揭示了晶体电场多重态中低能态的存在以及重费米子（HF）态的形成。分别在T(N)=2.2 K和T(c)=0.75 K出现的AFM和SC相的共存发生在微观层面。CePt₃Si是首个在T(c)以下1/T(1)出现峰值且此外不遵循大多数非常规HF超导体所报道的T³定律的HF超导体。我们注意到这种意外的SC特性可能与其晶体结构中缺乏反演中心有关。
