Colossal enhancement of upper critical fields in noncentrosymmetric heavy fermion superconductors near quantum criticality: CeRhSi$ 3$ and CeIrSi$ 3$ - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: Strong coupling effects on the upper critical fields $H {c2}$ along thec-axis in the noncentrosymmetric heavy fermion superconductors near quantumcriticality CeRhSi$ 3$ and CeIrSi$ 3$ are examined. For sufficiently largespin-orbit interactions due to the lack of inversion symmetry, $H {c2}$ ismainly determined by the orbital depairing effects. From microscopiccalculations taking into account the strong spin fluctuations, we show that$H {c2}$ is extremely enhanced as the system approaches the quantum criticalpoint, resulting in $H {c2}\sim 30$T even in the case with the low transitiontemperature $T cH=0\sim 1$K, which well explains the huge $H {c2}$ observedin the recent experiments. Our results reveal intrinsic and universalproperties common to strong coupling superconductivity caused by spinfluctuations near quantum criticality.



Author: Y. Tada, N. Kawakami, S. Fujimoto

Source: https://arxiv.org/







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