Reaching the unreachable: critical scaling at the superconducting transition |
| |
Authors: | M.B. Salamon W. Lee K. Ghiron J. Shi N. Overend M.A. Howson |
| |
Affiliation: | a Department of Physics, University of Illinois, Urbana, IL 61801-3080, USA b University of Leeds, Leeds, UK |
| |
Abstract: | The large coherence length of conventional superconductors causes the critical region near Tc to be unobservably small, leading to the impression that mean-field theory can adequately explain properties near the transition. The high-temperature superconductors, however, have such strongly type-II character that the critical, or at least an intermediate critical, region is experimentally accessible. We demonstrate the applicability of XY-like critical scaling to magnetization, heat capacity and conductivity data and through the fitting parameters, make contact with a strong-coupling calculation of the critical temperature. Further, the scaled conductivity data show clear evidence for a thermodynamic transition along the freezing line Hm(T)∝(1 − T/Tc)4/3. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|