Based on the linearized Eilenberger equations, the upper critical field (Hc2) of mixed dand s-wave superconductors has been microscopically studied with an emphasis on the competing effects of mass anisotropy and spin Zeeman coupling. We find the mass anisotropy always enhance Hc2 while the Zeeman interaction suppresses Hc2. As required by the thermodynamics, we find Hc2 is saturated at zero te...

We consider a model based on the thermal spike concept for an explanation of latent track formation in YBa2Cu3O7−x single crystal. The model demonstrates some interesting peculiarities such as ®electronic quenching ̄ and existence of bifurcation points. Arguments why the energy spent on damage creation in the track should be equal to melting heat and why the so-called ®epitaxial regrowth ̄ is imp...

We discuss the applied magnetic field dependence of the absorption of microwaves by a 3-dimensional array up to 30x30x30 Josephson junctions with random parameters including the resistivity, capacity and inductance of each junction. The numerical simulation results for the networks show characteristic microwave absorption anomalies observed in the ceramic samples of high temperature superconduc...

Josephson coupling between an s- and d-wave superconductor through a 50 nm thick Ca1-xSrxCuO2 antiferromagnetic layer was observed for the hybrid Nb/Au/Ca1-xSrxCuO2/YBa2Cu3O7-delta heterostructures and investigated as a function of temperature, magnetic field, and applied millimeter-wave electromagnetic radiation. The magnetic field dependence of the supercurrent I(c)(H) exhibits anomalously ra...

Elastic-to-plastic crossover below the peak effect in the vortex solid of YBa2Cu3O7 single crystals S. O. Valenzuela,1,* B. Maiorov, E. Osquiguil, and V. Bekeris Laboratorio de Bajas Temperaturas, Departamento de Fı́sica, Universidad de Buenos Aires, Pabellón I, Ciudad Universitaria, 1428 Buenos Aires, Argentina Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energı́a Atómic...

We measured forces applied by an actuator with a YBa2Cu3O7 (YBCO) film at near 77 K for the Large-scale Cryogenic Gravitational-wave Telescope (LCGT) project. An actuator consisting of both a YBCO film of 1.6 μm thickness and 0.81 cm area and a solenoid coil exerted a force of up to 0.2 mN on a test mass. The presented actuator system can be used to displace the mirror of LCGT for fringe lock o...