Evidence of nodal superconductivity in LaFeSiH
A. Bhattacharyya, P. Rodière, J.-B. Vaney, P. K. Biswas, A. D. Hillier, A. Bosin, F. Bernardini, S. Tencé, D. T. Adroja, A. Cano
DOI 10.1103/PhysRevB.101.224502 · Physical Review B
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Abstract
Unconventional superconductivity has recently been discovered in the iron-based superconducting silicide LaFeSiH. By using the complementary techniques of muon spin rotation, tunneling diode oscillator, and density-functional theory, we investigate the magnetic penetration depth and thereby the superconducting gap of this high-temperature superconductor. We find that the magnetic penetration depth displays a sub-T2 behavior in the low-temperature regime below Tc/3, which evidences a nodal structure of the gap (or a gap with very deep minima). Even if the topology of the computed Fermi surface is compatible with the s±-wave case with accidental nodes, its nesting and orbital-content features may eventually result in a d-wave state, which is more unusual for high-temperature superconductors of this class.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeSiH Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | onset |
| LaFeSiH Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | onset |
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