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We report the measurements of the $^{29}$Si Knight shift $^{29}K$ on thenoncentrosymmetric heavy-fermion compound CePt$_{3}$Si in whichantiferromagnetism (AFM) with $T_{\rm N}=2.2$ K coexists with superconductivity(SC) with $T_{c}=0.75$ K. Its spin part $^{29}K_{\rm s}$, which is deduced tobe $K_{\rm s}^{c}\ge 0.11$ and 0.16% at respective magnetic fields $H=2.0061$and 0.8671 T, does not decrease across the superconducting transitiontemperature $T_{c}$ for the field along the c-axis. The temperature dependenceof nuclear spin-lattice relaxation of $^{195}$Pt below $T_{c}$ has beenaccounted for by a Cooper pairing model with a two-component order parametercomposed of spin-singlet and spin-triplet pairing components.  From this result, it is shown that the Knight-shift data are consistent withthe occurrence of the two-component order parameter for CePt$_{3}$Si.Comment: 4pages, 4figure

Evidence for Novel Pairing State in Noncentrosymmetric Superconductor CePt3Si:29Si-NMR Knight Shift Study

Evidence for Novel Pairing State in Noncentrosymmetric Superconductor CePt₃Si:²⁹Si-NMR Knight Shift Study