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Extremely high upper critical magnetic field of the noncentrosymmetric heavy fermion superconductor CeRhSi3

, : Extremely high upper critical magnetic field of the noncentrosymmetric heavy fermion superconductor CeRhSi3. Physical Review Letters 98(19): 197001-197001

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.


PMID: 17677650

DOI: 10.1103/PhysRevLett.98.197001

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