Effect of strain inhomogeneity on a chiral 
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-wave superconductor

Yu, Yue

doi:10.1103/physrevb.100.094517

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…Stress-driven suppression of T TRSB could be balanced by the overall strengthening of superconductivity. At low stresses, we note that disorder [16,46] and fluctuations [47] are predicted to round off cusps, potentially weaking the observed stress dependence of T TRSB . Under the hypothesis of chirality, we speculate further that disorder could be the mechanism that splits T TRSB and T c in some samples even at zero stress.…”

Section: Sr Ruomentioning

confidence: 82%

Split superconducting and time-reversal symmetry-breaking transitions, and magnetic order in Sr$_2$RuO$_4$ under uniaxial stress

Grinenko,

Ghosh,

Sarkar

et al. 2020

Preprint

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Among unconventional superconductors, Sr 2 RuO 4 has become a benchmark for experimentation and theoretical analysis because its normal-state electronic structure is known with exceptional precision, and because of experimental evidence that its superconductivity has, very unusually, a spontaneous angular momentum, i.e. a chiral state. This hypothesis of chirality is however difficult to reconcile with recent evidence on the spin part of the order parameter. Measurements under uniaxial stress offer an ideal way to test for chirality, because under uniaxial stress the superconducting and chiral transitions are predicted to split, allowing the empirical signatures of each to be identified separately. Here, we report zerofield muon spin relaxation (ZF-µSR) measurements on crystals placed under uniaxial stresses of up to 1.05 GPa. We report a clear stress-induced splitting between the onset tempera-

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Section: Sr Ruomentioning

confidence: 82%

Split superconducting and time-reversal symmetry-breaking transitions, and magnetic order in Sr$_2$RuO$_4$ under uniaxial stress

Grinenko,

Ghosh,

Sarkar

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Furthermore, a very small heat capacity anomaly at T TRSB would indicate that the chiral state is fragile, and then the effect of disorder must also be considered. It is known that the superconductivity of Sr 2 RuO 4 is among the most sensitive to disorder 26 and disorder and fluctuations are predicted to round off the cusp predicted in the mean-field phase diagram 51,52 , potentially obscuring the intrinsic small-σ behaviour.…”

Section: Strontium Ruthenate (Sr 2 Ruo 4 ) Continues To Present An Immentioning

confidence: 99%

Split superconducting and time-reversal symmetry-breaking transitions in Sr2RuO4 under stress

et al. 2021

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or most of its history, the superconductivity of strontium ruthenate (Sr 2 RuO 4) (ref. 1) has been understood in terms of an odd-parity two-component order parameter with equal-spin pairing in the RuO 2 planes: p x ± ip y (refs. 2-5). This order parameter is chiral: the Cooper pairs have angular momentum l = ±1. The evidence for chirality comes from the zero-field muon spin relaxation (ZF-μSR) data 6 , observation of a non-zero Kerr rotation below the critical temperature T c (ref. 7) and signs in the junction experiments of domains in the superconducting state 8,9 , while evidence for equal-spin pairing came from the absence of a change in the Knight shift below T c in nuclear magnetic resonance 10 and polarized neutron scattering 11 measurements. The Knight shift is related to the spin susceptibility; in conventional opposite-spin-pairing superconductors, it is suppressed below T c. However, in new measurements, it has been found that the Knight shift is, in fact, suppressed below T c (refs. 12-14), by a magnitude that is unlikely to be reconcilable with equal-spin pairing. This revision has called into question a number of other results on Sr 2 RuO 4. It raises a particular challenge for experiments that indicate chirality, because opposite-spin pairing implies an even-parity momentum-space gap structure. If the order parameter is constrained to be even parity, chiral, and composed of components that are degenerate on the tetragonal lattice of Sr 2 RuO 4 , the only possibility is d xz ± id yz order 15. Under conventional understanding, this is a highly unlikely order parameter because it

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“…In general, for the same reasons discussed in ref. 32 in the context of an assumed two-component p-wave order parameter, such disorder rounds out any non-analytic cusp-like strain dependence of T c . The easiest limit in which to illustrate this is one in which the random strains are very long range correlated, so one can think of the system as consisting of essentially macroscopic regions with different strains.…”

Section: A Plausible Scenariomentioning

confidence: 99%

A proposal for reconciling diverse experiments on the superconducting state in Sr2RuO4

et al. 2020

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A variety of precise experiments have been carried out to establish the character of the superconducting state in Sr 2 RuO 4. Many of these appear to imply contradictory conclusions concerning the symmetries of this state. Here we propose that these results can be reconciled if we assume that there is a near-degeneracy between a d x 2 Ày 2 (B 1g in group theory nomenclature) and a g xyðx 2 Ày 2 Þ (A 2g) superconducting state. From a weak-coupling perspective, such an accidental degeneracy can occur at a point at which a balance between the on-site and nearest-neighbor repulsions triggers a d-wave to g-wave transition.

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Effect of strain inhomogeneity on a chiral p -wave superconductor

Cited by 6 publications

References 17 publications

Split superconducting and time-reversal symmetry-breaking transitions, and magnetic order in Sr$_2$RuO$_4$ under uniaxial stress

Split superconducting and time-reversal symmetry-breaking transitions, and magnetic order in Sr$_2$RuO$_4$ under uniaxial stress

Split superconducting and time-reversal symmetry-breaking transitions in Sr2RuO4 under stress

A proposal for reconciling diverse experiments on the superconducting state in Sr2RuO4

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