Normal and superconducting properties of noncentrosymmetric heavy fermion CeRhSi 3

Noriaki Kimura, Yuji Muro, Haruyoshi Aoki

Research output: Contribution to journalReview articlepeer-review

72 Citations (Scopus)

Abstract

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 (1.6K 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 26 kbar where T c reaches the maximum. Nearly perfect magneticshielding 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.

Original languageEnglish
Article number051010
Journaljournal of the physical society of japan
Volume76
Issue number5
DOIs
Publication statusPublished - 2007 May

Keywords

  • CeRhSi
  • Heavy fermion
  • Noncentrosymmetric superconductor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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