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
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.
PACS: 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) / 73.43.Nq – Quantum phase transitions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003