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Journal Articles Physical Review B Year : 2020

Evidence of nodal superconductivity in LaFeSiH

Pierre Rodière
Andrés Cano


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.
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hal-02733675 , version 1 (31-05-2023)



A. Bhattacharyya, Pierre Rodière, Jean-Baptiste Vaney, P. Biswas, A. Hillier, et al.. Evidence of nodal superconductivity in LaFeSiH. Physical Review B, 2020, 101 (22), pp.224502. ⟨10.1103/PhysRevB.101.224502⟩. ⟨hal-02733675⟩
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