Distinct reduction of Knight shift in superconducting state of Sr2RuO4 under uniaxial strain
Austin W. Lindquist, Hae-Young Kee
DOI 10.1103/PhysRevResearch.2.032055 · Physical Review Research
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Abstract
Shortly after the discovery of superconductivity in Sr2RuO4, spin-triplet pairing was proposed and further corroborated by a constant Knight shift (K) across the transition temperature (Tc). However, a recent experiment observed a drop in K at Tc which becomes larger under uniaxial strain, ruling out several spin-triplet scenarios. Here we show that even parity interorbital spin-triplet pairing can feature a d vector that rotates when uniaxial strain is applied, leading to a larger drop in the spin polarization perpendicular to the strain direction, distinct from spin-singlet pairing. We propose that anisotropic spin polarization under strain will ultimately differentiate triplet versus singlet pairing.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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