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

• Published in: Physica. C, Superconductivity Vol. 471; no. 21-22; pp. 854 - 858
• Main Authors: Pompeo, N., Rogai, R., Ausloos, M., Cloots, R., Augieri, A., Celentano, G., Silva, E.
• Format: Journal Article Web Resource
• Language: English
• Published: Elsevier B.V 01-11-2011; Elsevier
• Subjects: Barium zirconates; Chemistry; Chimie; Copper; COPPER OXIDE; Dissipation; DyBCO; Fixed temperature; FLUID FLOW; Low field; MAGNETIC FIELD; Magnetic field dependences; Magnetic fields; Melt-textured; Microwave property; MICROWAVES; Mixed state; Monodomain; Monodomains; Nanometrics; Physical, chemical, mathematical & earth Sciences; Physique, chimie, mathématiques & sciences de la terre; Single domains; Static magnetic fields; SUPERCONDUCTIVITY; SUPERCONDUCTORS; Surface impedance; Surface resistance; Viscosity; Vortex flow; Vortex motion; Vortex viscosity; Vortices; Weak links; YTTRIUM OXIDE; Surface impedance; Monodomain; Vortex viscosity; DyBCO
• ISSN: 0921-4534; 1873-2143; 1873-2143
• DOI: 10.1016/j.physc.2011.05.073

► Surface impedance measurements on Dy123 monodomains in the mixed state are presented. ► Larger London penetration depth is observed in the sample with stronger grain boundary signatures. ► The vortex viscosity of DyBCO monodomain shows same absolute values and temperature dependence as other 123 systems.
We report on microwave measurements on DyBa2Cu3O7−δ monodomains grown by the top-seeded melt-textured technique. We measured the field increase of the surface resistance Rs(H) in the a–b plane at 48.3GHz. Measurements were performed at fixed temperatures in the range 70K–Tc with a static magnetic field μ0H<0.8T 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 behavior of the sample under study. The magnetic field dependence of Rs(H) is ascribed to the dissipation caused by vortex motion. The analysis of Xs(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 YBa2Cu3O7−δ with nanometric BaZrO3 inclusions.