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Distinguishing \(d_{xz}+id_{yz}\) and \(d_{x2−y2}\) pairing in \(Sr_2RuO_4\) by high magnetic field H-T phase diagrams

Gupta, R., Shallcross, S., Quintanilla, J., Gradhand, M., Annett, J. (2022) Distinguishing \(d_{xz}+id_{yz}\) and \(d_{x2−y2}\) pairing in \(Sr_2RuO_4\) by high magnetic field H-T phase diagrams. Physical Review B: Condensed Matter and Materials Physics, 106 (11). Article Number 115126. ISSN 0163-1829. (doi:10.1103/PhysRevB.106.115126) (KAR id:91650)

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Employing a realistic tight-binding model describing the Fermi surface in the normal state of \(Sr_2RuO_4\) we map out magnetic field versus temperature phase diagrams for \(d_{x2−y2}(B_{1g})\) and \(d_{xz}+id_{yz}(E_g)\) pairing types. Both produce (i) a similar Knight shift suppression of ∼80% and (ii) a bicritical point at \(T=0.88K\) separating low field second order phase transitions from high field Pauli limiting first order transitions. We find, however, strikingly different phase behaviour within the high field Pauli limiting region. For \(d_{x2−y2}\) pairing symmetry an additional lower critical line of first order transitions is found (terminating in a critical point at \(T=0.09−0.22K\) depending on the choice of Hubbard U parameters) while for \(d_{xz}+id_{yz}\) no such additional high field phase transitions are found for any choice of Hubbard U. In conjunction with our earlier finding [{\it Physical Review B} {\bf 102} (23), 235203] for \(p\)-wave helical pairing of a still different high field phase structure (a lower critical field line meeting the upper critical field line exactly at the bicritical point), we suggest high field Pauli limiting phase structure as a possible route to distinguish pairing symmetries in this material.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.106.115126
Uncontrolled keywords: condensed matter physics, theoretical physics, superconductor, singlet pairing, d-wave pairing, pauli limiting
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QC Physics > QC176 Solid state physics
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Funders: University of Kent (
Depositing User: Jorge Quintanilla Tizon
Date Deposited: 18 Nov 2021 22:28 UTC
Last Modified: 08 Mar 2023 15:46 UTC
Resource URI: (The current URI for this page, for reference purposes)
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