First-order vortex-lattice melting transition in YBa2Cu3O7-δ near the critical temperature detected by magnetic torque

被引：74

作者：

Willemin, M

Schilling, A

Keller, H

Rossel, C

Hofer, J

Welp, U

Kwok, WK

Olsson, RJ

Crabtree, GW

机构：

[1] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

[2] IBM Corp, Div Res, Zurich Res Lab, CH-8803 Ruschlikon, Switzerland

[3] Argonne Natl Lab, Sci & Technol Ctr Superconductiv, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.81.4236

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

High-resolution magnetic-torque studies on an untwinned YBa2Cu3O7-delta Single crystal near its critical temperature T-c reveal that the first-order vortex-lattice melting transition (VLMT) persists at least up to 0.5 K below T-c. The associated sharp discontinuity in magnetization is detectable even at temperatures where the torque signal deviates from mean-field behavior due to fluctuations. The magnetic irreversibility at the VLMT can be suppressed by applying a weak transverse ac magnetic field. This offers the possibility of separating the irreversibility line from the melting line near T-c.

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页码：4236 / 4239

页数：4

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