Irreversibility and flux-lattice melting in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}
- Centre de Recherches sur les Tres Basses Temperatures, CNRS, BP166X, 38042 Grenoble (France)
- IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598 (United States)
- Department of Physics, The University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, V6T 1Z1 (CANADA)
We report on ac susceptibility measurements using a local Hall probe close to the melting point of the flux lattice in a clean, detwinned YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} (YBCO) single crystal. The critical current density, probed at a voltage level of 10{sup {minus}11} V, abruptly jumps from a null value in the liquid state to a small but finite value in the solid state. The resulting irreversible magnetization is below the resolution level of standard superconducting quantum interference device magnetometry. The temperature T{sub irr} where the critical current jumps coincides with the melting temperature T{sub m} as defined by dc magnetization. The above measurements establish a clear coincidence between the irreversibility line and the melting line in clean YBCO. The pinning force for the as-formed flux solid is shown to increase with its density. A critical end point is observed above a threshold value of the pinning force. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 530190
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 55, Issue 22; Other Information: PBD: Jun 1997
- Country of Publication:
- United States
- Language:
- English
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