Normal and Superconducting Properties of Noncentrosymmetric Heavy Fermion CeRhSi_3(<SPECIAL TOPICS>Frontiers of Novel Superconductivity in Heavy Fermion Compounds)

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We review the normal and superconducting properties in the noncentrosymmetric heavy-fermion CeRhSi_3. In the normal state, CeRhSi_3 exhibits the antiferromagnetic order at low temperatures (1.6 K at ambient pressure) although its Kondo temperature is much higher than the ordering temperature T_N. With applying pressure P, T_N initially increases and subsequently decreases. The superconductivity arises at the pressures where the antiferromagnetic transition occurs. T_N does not seem to fall to zero but becomes nearly constant with further application of pressure, and then T_N vs P merges with the superconducting transition temperature T_c vs P at 26kbar where T_c reaches the maximum. Nearly perfect magnetic-shielding associated with the superconductivity is observed below 26 kbar, suggesting that the bulk superconductivity is realized below T_N. We observe an anomaly below T_c in the resistivity as well as in the ac-susceptibility. The origin of the both anomalies seem to be the same but have not been clarified. The magnetic field-temperature (H-T) phase diagram of the superconducting state for fields along the tetragonal a-axis is unusual. It has a concave structure and the upper-critical-field H_<c2> at zero temperature exceeds the paramagnetic limiting field expected from the BCS model. The pressure dependence of H-T phase diagram implies that the paramagnetic effect exists and the effect is much reduced in CeRhSi_3. This result is consistent with the theoretical prediction for the noncentrosymmetric superconductor.
社団法人日本物理学会の論文
2007-05-15

Normal and Superconducting Properties of Noncentrosymmetric Heavy Fermion CeRhSi_3(<SPECIAL TOPICS>Frontiers of Novel Superconductivity in Heavy Fermion Compounds)

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