Eur. Phys. J. B 36, 377-383 (2003)
https://doi.org/10.1140/epjb/e2003-00356-3

Fluctuation conductivity in layered d-wave superconductors near critical disorder

¹ Department of Theoretical Physics, University of Cluj, 3400 Cluj-Napoca, Romania
² Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52245, USA
³ Max Plank Institute for the Physics of Complex Systems, 01187 Dresden, Germany

Corresponding author: ^a mcrisan@phys.ubbcluj.ro

Received: 27 June 2003
Revised: 10 October 2003
Published online: 23 December 2003

Abstract

We consider the fluctuation conductivity in the critical region of a disorder induced quantum phase transition in layered d-wave superconductors. We specifically address the fluctuation contribution to the system's conductivity in the limit of large (quasi-two-dimensional system) and small (quasi-three-dimensional system) separation between adjacent layers of the system. Both in-plane and c-axis conductivities were discussed near the point of insulator-superconductor phase transition. The value of the dynamical critical exponent, z=2, permits a perturbative treatment of this quantum phase transition under the renormalization group approach. We discuss our results for the system conductivities in the critical region as function of temperature and disorder.