Physics – Condensed Matter – Superconductivity
Scientific paper
2010-10-14
Phys. Rev. B 84, 064512 (2011)
Physics
Condensed Matter
Superconductivity
6 pages, 3 figures included; V2 has been considerably revised and contain a more detailed analysis of the Hall effect data
Scientific paper
LiFeAs is unique among the broad family of FeAs-based superconductors, because it is superconducting with a rather large $T_c\simeq 18$ K under ambient conditions although it is a stoichiometric compound. We studied the electrical transport on a high-quality single crystal. The resistivity shows quadratic temperature dependence at low temperature giving evidence for strong electron-electron scattering and a tendency towards saturation around room temperature. The Hall constant is negative and changes with temperature, what most probably arises from a van Hove singularity close to the Fermi energy in one of the hole-like bands. Using band structure calculations based on angular resolved photoemission spectra we are able to reproduce all the basic features of both the resistivity as well as the Hall effect data.
Borisenko S. V.
Buechner Bernd
Evtushinsky D. V.
Harnagea Luminita
Hess Ch.
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