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Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 27: SC: Fe-based Superconductors - LiFeAs

TT 27.6: Vortrag

Dienstag, 15. März 2011, 15:15–15:30, HSZ 304

Transport properties of LiFeAs — •Gerhard Kolland1, Oliver Heyer1, Stephanie Orbe1, Volodymyr Zabolotnyy2, Daniil Evtushinsky2, Sergiy Borisenko2, Igor Morozov2, Luminita Harnagea2, Sabine Wurmehl2, Christian Hess2, Bernd Büchner2, and Thomas Lorenz11II. Physikalisches Institut, Universität zu Köln, Germany — 2Leibniz-Institute for Solid State Research, IFW-Dresden, Germany

LiFeAs is unique among the broad family of FeAs-based superconductors, because it is the only stoichiometric compound that is superconducting at a rather large Tc≃ 18 K under ambient conditions. We studied electrical and thermal transport on high-quality single crystals. The low-temperature resistivity shows quadratic temperature dependence above Tc giving evidence for strong electron-electron scattering, while there is 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 holelike bands. From the anisotropic magnetic-feld dependence of Tc we extrapolate the correlation lengths ξi and derive a moderate anisotropy ξac ≃ 2.2. The thermal conductivity κ shows a shoulder below Tc. This feature is strongly suppressed by an applied magnetic field whereas below 1 K the thermal conductivity increases with increasing field.
   Supported by the DFG through SFB 608 and SPP1458.

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