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arXiv 1010.2876cond-mat.supr-con
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LiFeAs的电阻率和霍尔效应:电子-电子散射的证据

Resistivity and Hall effect of LiFeAs: Evidence for electron-electron scattering

O. Heyer, T. Lorenz, V. B. Zabolotnyy, D. V. Evtushinsky, S. V. Borisenko, I. Morozov, L. Harnagea, S. Wurmehl, C. Hess, B. Buechner

摘要:

LiFeAs在FeAs基超导体的大家族中是独特的,因为它在环境条件下具有相当大的$T_c\simeq 18$ K,尽管它是化学计量的化合物。我们研究了高质量单晶的电输运。电阻率在低温下呈二次温度依赖性,证明了强的电子-电子散射和室温附近的饱和趋势。霍尔常数是负的,并随温度而变化,这很可能是由于范霍夫奇点接近费米能的一个空穴带。使用基于角分辨光电子能谱的能带结构计算,我们能够再现电阻率和霍尔效应数据的所有基本特征。

英文摘要:

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.

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