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Evidence for novel pairing state in noncentrosymmetric superconductor CePt$$_3$$Si; $$^{29}$$Si-NMR Knight shift study

Yogi, Mamoru*; Mukuda, Hidekazu*; Kitaoka, Yoshio*; Hashimoto, Shin*; Yasuda, Takashi*; Settai, Rikio*; Matsuda, Tatsuma; Haga, Yoshinori   ; Onuki, Yoshichika; Rogl, P.*; Bauer, E.*

We report the measurements of the $$^{29}$$Si Knight shift $$^{29}$$K$$_s$$ on the noncentrosymmetric heavy-fermion compound CePt$$_3$$Si in which antiferromagnetism (AFM) with $$T_N$$=2.2 K coexists with superconductivity (SC) with $$T_c$$=0.75 K. Its spin part $$^{29}$$K$$_s$$, which is deduced to be K$$_{sc}$$$$>$$0.11 and 0.16 at respective magnetic fields H=2.0061 and 0.8671 T,. does not decrease across the superconducting transition temperature Tc for the field along the c-axis. The temperature dependence of nuclear spin-lattice relaxation of $$^{195}$$Pt below Tc 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 CePt$$_3$$Si.

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Category:Physics, Multidisciplinary

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