Volume 60, Number 1, October 2002
|Page(s)||141 - 147|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Competition between anisotropy and superconductivity in organic and cuprate superconductors
Physik-Institut der Universität Zürich -
Winterthurerstrasse 190 CH-8057 Zürich, Switzerland
Accepted: 8 July 2002
We analyze the empirical correlation between the zero-temperature penetration depth and the corresponding normal-state DC conductivity , measured slightly above the transition temperature , in different classes of quasi–two-dimensional superconductors, including cuprates and organics. For this purpose we invoke the scaling theory of quantum and finite-temperature critical phenomena. Important implications are: Superconductivity in the organic and cuprate superconductors is a genuine three-dimensional (3D) phenomenon. The competition between anisotropy and superconductivity destroys the latter in the 2D limit even in the ground state. The data uncovers the flow to quantum criticality, including the 2D quantum superconductor-to-insulator (2D-QSI) and the 3D quantum superconductor–to–normal-state (3D-QSN) transition. This flow gives a clear perspective of the regimes where quantum fluctuations are essential and mean-field treatments fail. Thus, a detailed account of the flow from mean-field to 2D-QSI criticality in organics and the crossover from the 2D-QSI to the 3D-QSN critical point in cuprates is a challenge for microscopic theories attempting to solve the puzzle of superconductivity in these materials.
PACS: 74.25.Bt – Thermodynamic properties / 74.25.Dw – Superconductivity phase diagrams / 74.25.-q – General properties; correlations between physical properties in normal and superconducting states
© EDP Sciences, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.