Nonlocal electrodynamics and the penetration depth of superconducting Sr2RuO4
Henrik S. Røising, Andreas Kreisel, Brian M. Andersen
DOI 10.1103/PhysRevB.110.094511 · Physical Review B
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Abstract
The thermal quasiparticles in a clean type-II superconductor with line nodes give rise to a quadratic low-temperature change of the penetration depth, Δλ∼T2, as first shown by Kosztin and Leggett [I. Kosztin and A. J. Leggett, Phys. Rev. Lett. 79, 135 (1997)]. Here, we generalize this result to multiple nodes and compare it to numerically exact evaluations of the temperature-dependent penetration depth in Sr2RuO4 using a high-precision tight-binding model. We compare the calculations to recent penetration depth measurements in high purity single crystals of Sr2RuO4 [J. F. Landaeta et al., Phys. Rev. B 110, L100503 (2024)]. When assuming the order parameter to have B1g symmetry, we find that both a simple dx2−y2-wave and complicated gap structures with contributions from higher harmonics and accidental nodes can accommodate the experimental data.
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. | 1.5 | Pressure not reported | unknown |
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