The effect of fluctuations on the electrical transport behavior in YBa2Cu3O(7-x)
Abstract
The excess conductivity behavior of highly oriented YBa2Cu3O(7-x) thin films prepared by both coevaporation and laser ablation was studied in detail in the reduced-temperature range 9 x 10(exp -4) is less than t is less than 1. The excess conductivity in all the films studied was found to diverge sharply near T(sub c), in agreement with the conventional mean-field theory. However, the detailed temperature dependence could not be fitted to either the power-law or the logarithmic functional forms as predicted by the theory. The excess conductivity of all the films was found to be exponentially dependent on the temperature over nearly three decades for 9 x 10(exp -4) is less than t is less than 10(exp -1), in contradiction to the mean-field theory.
- Publication:
-
Solid State Technology Branch of NASA Lewis Research Center: Fifth Annual Digest
- Pub Date:
- August 1993
- Bibcode:
- 1993sstb.nasa..255V
- Keywords:
-
- Phase Transformations;
- Superconducting Films;
- Thin Films;
- Ybco Superconductors;
- Electron Transfer;
- Evaporation;
- Laser Ablation;
- Temperature Dependence;
- Solid-State Physics