Abstract
Aspects of magnetic-flux dynamics in different types of samples of the high-temperature superconductor YBa2Cu3Ox have been investigated in magnetic fields below 1 Oe and at 77 K. The experiments were carried out in an arrangement including a field coil, a flat sample perpendicular to the field, and a radio frequency-superconducting quantum interference device (RF-SQUID) along a common axis. For epitaxial thin films the Meissner effect was established. For a ceramic sample it was found that field changes of order 10(-2) Oe affect the flux distribution inside the sample. The observations can explain why RF-SQUID' s made from this ceramic operate in the nonhysteretic mode. The central object was an epitaxial film with a large density of defects. In this film the dynamics of the mixed state show features expected in ''spin-glass'' models.
| Original language | English |
|---|---|
| Journal | Physical Review B |
| Volume | 49 |
| Issue number | 9 |
| Pages (from-to) | 6378-6381 |
| ISSN | 2469-9950 |
| DOIs | |
| Publication status | Published - 1994 |
Bibliographical note
Copyright (1994) by the American Physical Society.Keywords
- 77-K