LaCaBaCu3O7 (La1113) is a superconductor below TC(onset)=80K and its structure is similar to the tetragonal YBCO. In this work the magnetic properties of a bulk La1113 sample are reported and compared to those of YBCO superconductor. We explore a possibly relation of this property to its particular crystalline structure, particularly to the oxygen deficiency. In contrast to a bulk YBCO, some ma...

– The superconducting current-phase relation (CPR) of Nb/Au/(001)YBa2Cu3Ox heterojunctions prepared on epitaxial c-axis oriented YBa2Cu3Ox thin films has been measured in a single-junction interferometer. For the first time, the second harmonic of the CPR of such junctions has been observed. The appearance of the second harmonic and the relative sign of the first and second harmonics of the CPR...

We have studied systematically the role of silver in improving microstructure and properties of Y1Ba2Cu3O7 YBCO thin films. We have more than doubled the grain size to nearly 1.8 m and reduced processing temperatures by incorporating Ag in the YBCO films, which is accomplished by using a composite target containing 15% by weight of Ag. These films show approximately four times higher Jc than th...

We report measurements of the temperature and power dependence of the microwave frequency intermodulation distortion (IMD) in high quality pulsed laser deposition (PLD) Yttrium Barium Copper Oxide (YBCO) on LaAlO 3 substrate. A low-temperature (T < 30 K) increase in IMD is the observation of an upturn of the nonlinear coefficient of the quadratic field dependence of the penetration depth. This ...

This work is devoted to the study of epitaxial YBCO films obtained by laser sputtering during deposition into windows special preliminary topology mask. The morphology surface structures was studied electron microscopy, electrical characteristics superconducting bridges were measured: critical temperature and current density. possibility forming a given with defect-free regions micron sizes whi...

The parallel plate resonator method has been used for measuring high quality YBa2Cu3O7−x (YBCO) thin films, which have low temperature residual losses comparable to those previously obtained in single crystals. The surface resistance and the real part of the conductivity show a non-monotonic behaviour with a broad peak around 45 K. The penetration depth and the real part of the conductivity var...

We have used the Low-Temperature Laser Scanning Microscope (LTLSM) technique for a spatially resolved investigation of the microwave transport properties, nonlinearities, and material inhomogeneities in an operating coplanar waveguide YBa2Cu3O7−δ (YBCO) microwave resonator on a LaAlO3 (LAO) substrate. The influence of twin-domain blocks, in-plane rotated grains, and micro-cracks in the YBCO fil...

We examine the application of Josephson radiation emitters to spectral calibration of singlephoton-resolving detectors. Josephson junctions were patterned in a YBCO film on a bi-crystal sapphire substrate and were voltage controlled to generate radiation in the frequency range of 0.051 THz. The detector used in this work consisted of a gate-defined quantum dot photon-to-charge transducer couple...

Inelastic Neutron Scattering (INS) data in La2-xSrxCuO4 (LSCO), YBa2Cu3O6+x (YBCO) and Bi2Sr2CaCu2O8+x (Bi2212) are discussed. In the literature, the INS spectra remain far from being comprehensively understood. We show that local (Q-integrated) susceptibility data and the energy dependence of the spin susceptibility at antiferromagnetic vector, QAF = (π,π), can be interpreted by using the phas...