LiFeAs is unique among the broad family of FeAs-based superconductors, because it is superconducting with a rather large Tc≃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.
@article{arxiv.1010.2876,
title = {Resistivity and Hall effect of LiFeAs: Evidence for electron-electron scattering},
author = {O. Heyer and T. Lorenz and V. B. Zabolotnyy and D. V. Evtushinsky and S. V. Borisenko and I. Morozov and L. Harnagea and S. Wurmehl and C. Hess and B. Buechner},
journal= {arXiv preprint arXiv:1010.2876},
year = {2015}
}
Comments
6 pages, 3 figures included; V2 has been considerably revised and contain a more detailed analysis of the Hall effect data