Time-reversal symmetry breaking from lattice dislocations in superconductors

Abstract

Spontaneous generation of time-reversal symmetry breaking in unconventional superconductors is currently a topic of considerable interest. While chiral superconducting order is often assumed to be the source of such signatures, they can sometimes also arise from nonmagnetic disorder. Here we perform a theoretical study of the impact of dislocations on the superconducting order parameter within a microscopic one-band model which, in the homogeneous case, features either extended $s$-wave, $d$-wave, or $s+id$-wave superconductivity depending on the electron concentration. We find that the dislocations minimize their impact on the superconducting condensate by inducing localized supercurrents pinned by the dislocations, even well outside the $s+id$ regime. We map out the parameter and density dependence of the induced currents. From these results we conclude that quite generically unconventional superconductors hosting dislocations tend to break time-reversal symmetry locally.

8 pages, 4 figures

References in corpus (21)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Time-reversal symmetry-breaking charge order in a kagome superconductor
• Evidence for time-reversal symmetry breaking in the non-centrosymmetric superconductor LaNiC${}_2$
• Unconventional Superconductivity in UTe2
• Pairing State with a time-reversal symmetry breaking in FeAs based superconductors
• Tunable nodal kagome superconductivity in charge ordered RbV3Sb5
• Disorder-Induced Static Antiferromagnetism in Cuprate Superconductors
• High sensitivity heat capacity measurements on Sr2RuO4 under uniaxial pressure
• Inhomogeneous time-reversal symmetry breaking in ${\mathrm{Sr}}_2\mathrm{Ru}{\mathrm{O}}_4$
• Disorder-induced freezing of dynamical spin fluctuations in underdoped cuprates
• Superconductivity from repulsive interactions on the kagome lattice
• Unconventional disorder effects in correlated superconductors
• Spontaneous currents in a superconductor with s+is symmetry
• Emergent defect states as a source of resistivity anisotropy in the nematic phase of iron pnictides
• Distinguishing between $s+id$ and $s+is$ pairing symmetries in multiband superconductors through spontaneous magnetization pattern induced by a defect
• Heat capacity double transitions in time-reversal symmetry broken superconductors
• Supercurrents and spontaneous time-reversal symmetry breaking by nonmagnetic disorder in unconventional superconductors
• Phase diagram of dirty two-band superconductors and observability of impurity-induced $s+is$ state
• Revisiting superconductivity in the extended one-band Hubbard model: pairing via spin and charge fluctuations
• Local magnetization nucleated by non-magnetic impurities in Fe-based superconductors
• Magnetic anisotropy from linear defect structures in correlated electron systems

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• Spontaneous time-reversal symmetry breaking by disorder in superconductors
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• Inherent momentum-dependent gap structure of altermagnetic superconductors
• Impurity strength-temperature phase diagram with phase crystals and competing time-reversal symmetry breaking states in nodal $d$-wave superconductors
• Dislocation Patterning as a Mechanism for Flat Band Formation