Melting and dimensionality of the vortex lattice in YBa2Cu3O6.60

Article

关键词: MUON-SPIN-ROTATION;    MAGNETIC PENETRATION DEPTH;    T-C SUPERCONDUCTORS;    FIELD PHASE-DIAGRAM;    FLUX-LINE-LATTICE;    UNTWINNED YBA2CU3O7-DELTA;    ANISOTROPIC SUPERCONDUCTORS;    LAYERED SUPERCONDUCTORS;    THERMAL FLUCTUATIONS;    SURFACE IMPEDANCE;   

DOI  :  10.1103/PhysRevB.61.R890

来源: SCIE

【 摘 要 】

Muon spin rotation (mu SR) measurements of the magnetic-field distribution n(B) in the vortex state of the oxygen deficient high-T-c superconductor YBa2Cu3O6.60 reveal a vortex-lattice melting transition at much lower temperature than that in the fully oxygenated material. The transition is best described by a model in which adjacent layers of pancake vortices decouple in the Liquid phase. In some samples we also observe changes in n(B) which are consistent with a vortex lattice which becomes disordered along the field direction above a crossover held B-cr. A transition of this nature has previously been reported in the highly anisotropic superconductor Bi2+xSr2-xCaCu2O8+y.

【 授权许可】

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