Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 48: Correlated Electrons: Quantum-Critical Phenomena - Theory

TT 48.2: Vortrag

Mittwoch, 13. März 2013, 17:15–17:30, H19

Conductivity close to antiferromagnetic criticality — Sergey Syzranov and •Jörg Schmalian — Institut für Theorie der Kondensierten Materie, Karlsruher Institut für Technologie

We study the conductivity of a three dimensional disordered metal close to an antiferromagnetic instability within the framework of the spin-fermion model[1]. We calculate the interaction correction to the conductivity, assuming that the latter is dominated by disorder scattering, and the interaction is weak. Although the fermionic scattering rate shows critical behaviour on the entire Fermi surface, the interaction correction is dominated by processes near the hot spots, narrow regions of the Fermi-surface corresponding to the strongest spin-fermion scattering. We discuss the scaling behavior of the conductivity as function of frequency and temperature and the role of quantum corrections to the semi-classical Boltzmann theory of transport.
[1] S. Syzranov, and J. Schmalian, Phys. Rev. Lett. 109, 156403 (2012)