Tuning the parity of superconductivity in CeRh2As2 via pressure

Abstract

In the recently discovered heavy fermion superconductor CeRh2As2, a magnetic field induced phase transition has been observed inside the superconducting state, which is proposed to be a transition from an even to an odd-parity superconducting state. The odd-parity superconducting state and its large upper critical field has been explained by local inversion symmetry breaking and consequent Rashba spin-orbit coupling. Here we report the experimental tuning of the parity of superconductivity in CeRh2As2 via applied pressure. Superconductivity is enhanced by pressure after its initial suppression, forming a second dome. However, the odd-parity state only exists in the first dome and the second dome is dominated by the even-parity state. This parity switch of superconductivity under pressure is consistent with the competition between Rashba spin-orbit coupling and interlayer hopping in determining the parity of superconductivity in systems with local inversion symmetry breaking. Our results provide insightful guidance on how to look for new odd-parity superconductors.

References in corpus (10)

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Cited by in corpus (12)

• Discovery of magnetic phase transitions in heavy-fermion superconductor CeRh${}_2$As${}_2$
• Coexistence of near-EF flat band and van Hove singularity in a two-phase superconductor
• Pressure-tuned quantum criticality in the locally non-centrosymmetric superconductor CeRh${}_2$As${}_2$
• Exposing the odd-parity superconductivity in CeRh${}_2$As${}_2$ with hydrostatic pressure
• Effects of nucleation at a first-order transition between two superconducting phases: Application to CeRh${}_2$As${}_2$
• Field-induced superconductivity mediated by odd-parity multipole fluctuation
• Superconducting meron phase in locally noncentrosymmetric superconductors
• Phase evolution of Ce-based heavy-fermion superconductors under compression: a combined first-principle and effective-model study
• Reciprocal and nonreciprocal paraconductivity in bilayer multiphase superconductors
• La substitution studies on the heavy-fermion superconductor CeRh${}_2$As${}_2$
• Quantum geometric magnetic monopole and two-phase superconductivity in CeRh${}_2$As${}_2$
• Multipolar fluctuations from localized 4f electrons in CeRh2As2