Extremely high upper critical magnetic field of the noncentrosymmetric heavy fermion superconductor CeRhSi3 |
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Authors: | Kimura N Ito K Aoki H Uji S Terashima T |
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Institution: | Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan. |
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Abstract: | We report an extremely high upper critical field B(c2) in the noncentrosymmetric heavy fermion superconductor CeRhSi3 for a magnetic field B along the tetragonal c axis. B(c2)(T=0) possibly reaching 30 T is much higher than B(c2)(0)=7 T for B perpendicular c and greatly exceeds the paramagnetic limiting field. The strong anisotropy of B(c2)(0) with extremely high B(c2)(0) for B || c is qualitatively explained by the paramagnetic pair-breaking mechanism specific to the noncentrosymmetric superconductor. However, an unusual B(c2)(T) curve with a positive curvature for B || c cannot be explained satisfactorily by conventional orbital pair-breaking models. |
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