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Unusual H−T phase diagram of CeRh2As2: The role of staggered noncentrosymmetricity


Schertenleib, Eric G; Fischer, Mark H; Sigrist, Manfred (2021). Unusual H−T phase diagram of CeRh2As2: The role of staggered noncentrosymmetricity. Physical Review Research, 3(2):023179.

Abstract

Superconductivity in a crystalline lattice without inversion is subject to complex spin-orbit-coupling effects, which can lead to mixed-parity pairing and an unusual magnetic response. In this study, the properties of a layered superconductor with alternating Rashba spin-orbit coupling in the stacking of layers, hence (globally) possessing a center of inversion, is analyzed in an applied magnetic field, using a generalized Ginzburg-Landau model. The superconducting order parameter consists of an even- and an odd-parity pairing component which exchange their roles as dominant pairing channel upon increasing the magnetic field. This leads to an unusual kink feature in the upper critical field and a first-order phase transition within the mixed phase. We investigate various signatures of this internal phase transition. The physics we discuss here could explain the recently found H−T phase diagram of the heavy-fermion superconductor CeRh2As2.

Abstract

Superconductivity in a crystalline lattice without inversion is subject to complex spin-orbit-coupling effects, which can lead to mixed-parity pairing and an unusual magnetic response. In this study, the properties of a layered superconductor with alternating Rashba spin-orbit coupling in the stacking of layers, hence (globally) possessing a center of inversion, is analyzed in an applied magnetic field, using a generalized Ginzburg-Landau model. The superconducting order parameter consists of an even- and an odd-parity pairing component which exchange their roles as dominant pairing channel upon increasing the magnetic field. This leads to an unusual kink feature in the upper critical field and a first-order phase transition within the mixed phase. We investigate various signatures of this internal phase transition. The physics we discuss here could explain the recently found H−T phase diagram of the heavy-fermion superconductor CeRh2As2.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > General Physics and Astronomy
Language:English
Date:4 June 2021
Deposited On:30 Jun 2021 15:22
Last Modified:25 Feb 2024 02:40
Publisher:American Physical Society
ISSN:2643-1564
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/physrevresearch.3.023179
Project Information:
  • : FunderSNSF
  • : Grant ID200020_184739
  • : Project TitleSupraleitung und Magnetismus in starkkorrelierten Elektronensystemen
  • Content: Published Version
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)