Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1820105 | Physica C: Superconductivity and its Applications | 2007 | 4 Pages |
Abstract
In order to study the vortex phase diagram near the lower critical point Hlcp of the first-order melting transition, we have measured resistivity Ï(H, T) and magnetization M(H) in untwinned YBa2Cu3O7 single crystals. Below Hlcp, the resistive transition is described by the vortex glass theory and the relatively small value of the critical exponent can be explained by the recent theory of the vortex glass scaling which takes into account the pinning disorder strength. The partial loop measurements of M(H) with repeated field cycling provide evidence of the first-order transition at the onset of the peak effect Hâ(T) between the Bragg glass and the vortex glass phases.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Terukazu Nishizaki, Kenji Shibata, Norio Kobayashi,