Magnetization anomalies above the vortex lattice melting transition.
A weak irreversible behavior was found in magnetization hysteresis curves in pristine as well as heavy-ion-irradiated Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} single crystals measured by a SQUID magnetometer both above the vortex lattice melting transition in lower fields and the vortex-glass transition in higher fields. The onset of this anomaly on magnetic field H{sub F} strongly depends on sample disorder level, and begins to appear in the middle of the first-order phase transition. H{sub F} systematically shifts to higher temperature and field region with increasing the number of columnar defects. The results are interpreted by a disorder-induced pinning, which is effective below H{sub F} and becomes ineffective above H{sub F}.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 943145
- Report Number(s):
- ANL/MSD/JA-37828
- Journal Information:
- Physica B, Journal Name: Physica B Journal Issue: 2000 Vol. 284-288; ISSN PHYBE3; ISSN 0921-4526
- Country of Publication:
- United States
- Language:
- ENGLISH
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