期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.087002
关键词
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资金
- Canadian Institute for Advanced Research
- Canada Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada
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 Delta(1) = 5.3 +/- 0.1 meV and Delta(2) = 2.5 +/- 0.2 meV. The gaps close as the temperature is increased to the bulk T-c, indicating that the surface accurately represents the bulk. A dip-hump structure is observed below T-c with an energy scale consistent with a magnetic resonance recently reported by inelastic neutron scattering.
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