Speaker
Description
Motivated by the recent experimental results on the quantum critical transport properties of iron-based superconductors, we investigate the effects of quantum fluctuations on the conductivity of multiband metals near the superconducting quantum critical point (QCP). We consider a minimal model with two nested two-dimensional Fermi surfaces and disorder potentials which include both intra- and inter-band scattering. Inter-band scattering leads to full suppression of the superconducting transition similar to the effect of paramagnetic impurities in an isotropic single-band superconductor. We compute the corrections to conductivity due to superconducting
fluctuations and reveal their nonmonotonic temperature dependence. The sign of conductivity correction depends on how the critical point is approached on the phase diagram. We will contrast these results to other known examples of QCP including (i) fluctuations near the upper critical field, (ii) fluctuations in the Pauli-limited regime, and (iii) fluctuations near the depairing type phase transition controlled by the orbital effect of an in-plane magnetic field.
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