| Affiliation: | (1) Department of Theoretical Physics, University of Cluj, 3400 Cluj-Napoca, Romania;(2) Department of Physics and Astronomy, University of Iowa, 52245 Iowa City, IA, USA;(3) Max Plank Institute for the Physics of Complex Systems, 01187 Dresden, Germany |
| 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.Received: 10 October 2003, Published online: 23 December 2003PACS: 74.40. + k Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) - 73.43.Nq Quantum phase transitions |
