Flux pinning and phase diagrams in amorphous Ta0.3Ge0.7/Ge multilayers with coplanar defects

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTORS;    COLUMNAR DEFECTS;    VORTEX DYNAMICS;    FLUCTUATIONS;    LOCALIZATION;    ANISOTROPY;    TRANSPORT;    VORTICES;    CRYSTALS;   

DOI  :  10.1103/PhysRevB.63.184502

来源: SCIE

【 摘 要 】

We report dc conductance measurements in the mixed state on two similar Ta0.3Ge0.7/Ge superconducting multilayers with distinct differences in their intrinsic columnar microstructure. We measured flux flow activation energies and mapped the dynamic vortex phase diagram for magnetic fields aligned along and at large angles to the columnar microstructure. The data conform well with models on entangled vortex liquids and freezing into a strongly pinned glass phase at the field dependent,melting temperature; The multilayer with the more pronounced columnar structure shows strongly enhanced flux pinning for fields both along and at large angles to the columns.

【 授权许可】

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