Microwave properties of DyBCO monodomain in the mixed state and comparison with other RE-BCO systems

Abstract

We report on microwave measurements on DyBa${}_2$Cu${}_3$O${}_{7-\delta }$ monodomains grown by the top-seeded melt-textured technique. We measured the field increase of the surface resistance $R_{\mathrm{s}}(H)$ in the a-b plane at 48.3 GHz. Measurements were performed at fixed temperatures in the range 70 K - $T_{\mathrm{c}}$ with a static magnetic field ${\mu }_{0}H<0.8$ T parallel to the c-axis. Low field steep increase of the dissipation, typical signature of the presence of weak links, is absent, thus indicating the single-domain behaviour of the sample under study. The magnetic field dependence of $R_{\mathrm{s}}(H)$ is ascribed to the dissipation caused by vortex motion. The analysis of $X_{\mathrm{s}}(H)$ points to a free-flow regime, thus allowing to obtain the vortex viscosity as a function of temperature. We compare the results with those obtained on RE-BCO systems. In particular, we consider strongly pinned films of YBa${}_2$Cu${}_3$O${}_{7-\delta }$ with nanometric BaZrO${}_3$ inclusions.

17 pages, 5 figures; ISS2010 proceedings, to be published as a special issue of Physica C

References in corpus (8)

• Flux flow of Abrikosov-Josephson vortices along grain boundaries in high-temperature superconductors
• Reliable determination of vortex parameters from measurements of the microwave complex resistivity
• The electronic state of vortices in YBa2Cu3Oy investigated by complex surface impedance measurement
• Nonlinear dynamics of vortices in easy flow channels along grain boundaries in superconductors
• Strong reduction of field-dependent microwave surface resistance in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ with sub-micrometric BaZrO${}_3$ inclusions
• Reduction of the field-dependent microwave surface resistance in YBa_2Cu_3O_7 with sub-micrometric BaZrO_3 inclusions as a function of BaZrO_3 concentration
• Microwave properties of DyBa_2Cu_3O_(7-x) monodomains and related compounds in magnetic fields
• Peak effect in laser ablated DyBa2Cu3O7-d films at microwave frequencies at subcritical currents

Cited by in corpus (1)

• Vortex pinning and flux flow microwave studies of coated conductors