Sequential vortex states upon lattice melting in untwinned single-crystal YBa{sub 2}Cu{sub 3}O{sub 7}
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 593 (Japan)
- Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki 319-11 (Japan)
Simultaneous measurements of the ac susceptibility and the dc magnetization of an untwinned single-crystal YBa{sub 2}Cu{sub 3}O{sub 7} have been carried out to clarify the nature of vortex lattice melting. The first-order melting transition appears as a jump in the dc magnetization. Evidence for effectual pinning at temperatures above the melting transition is obtained as a sharp transition in {chi}{sup {prime}} and a sharp peak in {chi}{sup {double_prime}} of width 0.2 K in 10 kG. In addition, a precursor lattice softening phenomenon can be seen in {chi}{sup {prime}} and {chi}{sup {double_prime}} at temperatures below the melting temperature. This sequential change is more visible when the ac susceptibility is given in the {chi}{sup {prime}}{endash}{chi}{sup {double_prime}} representation. It has been confirmed that there exists a melting transition of YBa{sub 2}Cu{sub 3}O{sub 7} even below 10 kG. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 538565
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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