Scanning Tunneling Spectroscopy of Superconducting LiFeAs Single Crystals: Evidence for Two Nodeless Energy Gaps and Coupling to a Bosonic Mode

Shun Chi; S. Grothe; Ruixing Liang; P. Dosanjh; W. N. Hardy; S. A. Burke; D. A. Bonn; Y. Pennec

doi:10.1103/PhysRevLett.109.087002

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Scanning Tunneling Spectroscopy of Superconducting LiFeAs Single Crystals: Evidence for Two Nodeless Energy Gaps and Coupling to a Bosonic Mode

Shun Chi, S. Grothe, Ruixing Liang, P. Dosanjh, W. N. Hardy, S. A. Burke, D. A. Bonn, Y. Pennec

DOI 10.1103/PhysRevLett.109.087002 · Physical Review Letters

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Abstract

The superconducting compound LiFeAs is studied by scanning tunneling microscopy and spectroscopy. A gap map of the unreconstructed surface indicates a high degree of homogeneity in this system. Spectra at 2 K show two nodeless superconducting gaps with Δ1=5.3±0.1 meV and Δ2=2.5±0.2 meV. The gaps close as the temperature is increased to the bulk Tc, indicating that the surface accurately represents the bulk. A dip-hump structure is observed below Tc with an energy scale consistent with a magnetic resonance recently reported by inelastic neutron scattering.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	17	Pressure not reported	onset
LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	17	Pressure not reported	unknown
BaFe1.8Co0.2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown