Evidence of nodal superconductivity in LaFeSiH
arXiv:1910.13258 · doi:10.1103/PhysRevB.101.224502
Abstract
Unconventional superconductivity has recently been discovered in the first 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 novel high-temperature superconductor. We find that the magnetic penetration depth displays a sub- behavior in the low-temperature regime below , 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 -wave case with accidental nodes, its nesting and orbital-content features may eventually result in a -wave state, more unusual for high-temperature superconductors of this class.
arXiv comment6 pages, 2 tables, 3 figures; v2: improved discussion and organization, 4 figs, 1 table
References in corpus (24)
- Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
- Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsOF}
- Gap symmetry and structure of Fe-based superconductors
- Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
- Pnictogen height as a possible switch between high-T_c nodeless and low-T_c nodal pairings in the iron based superconductors
- Iron-Based Superconductors: current status of materials and pairing mechanism
- Magnetic Penetration Depth in Unconventional Superconductors
- Properties of the Ideal Ginzburg-Landau Vortex Lattice
- Evidence for nodal superconductivity in LaFePO
- London Penetration Depth in Iron - based Superconductors
- Field and Temperature Dependence of the Superfluid Density in LaO_{1-x}F_xFeAs Superconductors: A Muon Spin Relaxation Study
- Using Gap Symmetry and Structure to Reveal the Pairing Mechanism in Fe-based Superconductors
- Exponential Temperature Dependence of Penetration Depth in Single Crystal MgB_2
- Exotic d-wave superconductivity in strongly hole doped K(x)Ba(1-x)Fe2As2
- Evolution of superconductivity in Fe-based systems with doping
- Origin of Gap Anisotropy in Spin Fluctuation Models of the Fe-pnictides
- Disorder-induced topological change of the superconducting gap structure in iron pnictides
- Anisotropic pairing in the iron pnictides
- Direct evidence for the emergence of a pressure induced nodal superconducting gap in the iron-based superconductor Ba_0.65Rb_0.35Fe_2As_2
- Iron-based superconductivity extended to the novel silicide LaFeSiH
- A brief review on muSR studies of unconventional Fe and Cr-based superconductors
- Magnetic penetration depth and in superconducting nickelates
- S-wave superconductivity probed by measuring magnetic penetration depth and lower critical field of MgCNi single crystals
- First-principles study of magnetism, lattice dynamics, and superconductivity in LaFeSiH