Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 68: Superconductivity: Fe-based Superconductors - Theory I
TT 68.10: Talk
Wednesday, April 2, 2014, 17:45–18:00, HSZ 201
Negative transport times in Fe-based superconductors — •Maxim Breitkreiz1, Philip M. R. Brydon2, and Carsten Timm1 — 1Institute of Theoretical Physics, Technische Universität Dresden, Dresden, Germany — 2Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, USA
Negative transport times lead to unexpected transport behavior such as negative magnetoresistance, strongly enhanced Hall coefficient, and reduced resistivity. Within a semiclassical Boltzmann approach beyond the relaxation-time approximation, we demonstrate that negative transport times can arise in iron pnictides due to scattering of charge carriers at spin fluctuations. To explore this effect, we consider the temperature dependence of transport coefficients for a phenomenological two-band model relevant for iron pnictides.