Abstract
Reversible thermal annealing of YBa2Cu3Ox single crystals in air has been studied by microwave loss measurements. Among the advantages of this contactless technique are the following: Crystals are kept in sealed capillaries throughout cycles of annealing and low-temperature measurement; features are resolved in loss versus temperature measurements that are not revealed by other techniques. Microwave loss is interpreted in terms of the Gittleman-Rosenblum model of fluxon motion in a viscous medium. Narrow temperature ranges are found for the formation of the 60- and 90-K phases. Optimal microwave response is obtained after but a few hours of annealing, indicating the importance of c-axis diffusion.
| Original language | English |
|---|---|
| Pages (from-to) | 1837-1841 |
| Number of pages | 5 |
| Journal | Physical Review B |
| Volume | 41 |
| Issue number | 4 |
| DOIs | |
| State | Published - 1990 |