Volume 40, Number 1, October 1997
|Page(s)||79 - 84|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Crossover and quantum critical phenomena in high-temperature superconductors
Physik-Institut, Universität Zürich,
Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
Accepted: 19 August 1997
We apply the scaling theory of quantum phase transitions to the experimental phase diagram of high-temperature superconductors in the temperature-doping plane. We find that the relation between transition temperature Tc and zero-temperature penetration depth, and the sheet resistance become universal in the underdoped limit where the materials are essentially 2D and the insulator-to-superconductor transition occurs. The predominance of phase fluctuations in this doping regime manifests itself as a suppression of the fermionic density of states around the chemical potential, that is, in terms of a pseudogap. This provides a natural explanation of a variety of measurements, which show a pseudogap opening above Tc. We also discuss the implications of the disappearance of the pseudogap in the overdoped regime in terms of mean-field superconductor-to-normal state transitions.
PACS: 74.20.De – Phenomenological theories (two-fluid, Ginzburg-Landau, etc.) / 74.25.Dw – Superconductivity phase diagrams / 74.25.Bt – Thermodynamic properties
© EDP Sciences, 1997
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.