Behavior of ρab(T ) and RH(T ) is presented for LSCO and YBCO single crystals in the lightly hole-doped antiferromagnetic region, with an emphasis on the RH(T ) data. In both systems, RH is virtually constant at moderate temperatures and tends to increase at low temperatures. Since essentially the same behavior of ρab(T ) and RH(T ) is observed in both LSCO and YBCO, we discuss that the in-plan...

We examine the application of Josephson radiation emitters to spectral calibration of single-photonresolving detectors. Josephson junctions are patterned in a YBCO film on a bicrystal sapphire substrate and are voltage controlled to generate radiation in the frequency range of 0.05–1 THz. The detector used in this work consists of a gate-defined quantum-dot photon-to-charge transducer coupled t...

A modified flux-coupling type superconducting fault current limiter (SFCL) is proposed here for suppressing currents. The SFCL consists of a coupling transformer, an yttrium barium copper oxide (YBCO) pancake coil, and controlled switch. By flexibly adjusting the switch's contact states based on system operational conditions, transformer's primary inductance as well YBCO coil's normal-state res...

The use of monolithic high temperature superconductors in multipole configurations is analyzed in this paper. The properties of monolithic high temperature superconductors have been well documented, and monolithic tubes, disks and rods of different cross section and sizes can presently be obtained from several commercial vendors. In this paper, design issues of quadrupole magnets using single c...

We present an analytical thermal model to explain the crosstalk in YBCO edge-transition bolometer arrays. The verification of the model was tested on sample array devices made of 200 and 400 nm YBCO films on LaAlO3 and SrTiO3 substrates. The model presented was able to explain the effects of the various physical parameters of the devices, such as the film thickness, operating temperature, and t...

In-plane resistance and magnetization measurements were performed on La0:7Ca0:3MnO3=YBa2Cu3O7 d=La0:7Ca0:3MnO3 (LCMO/ YBCO/LCMO) trilayers below the superconducting transition temperature of the YBCO layer. Two magnetoresistance (MR) peaks were found: The first MR peak is consistent with the suppression of superconductivity due to the stray fields generated by the domain walls and the second on...

In-plane aligned, c-axis oriented YBazCu307 (YBCO) films with superconducting critical current densities, Jc, as high as 700,000 amperes per square centimeter at 77 kelvin have been grown on thermo-mechanically, rolled-textured (00 1) Ni tapes using pulsed-laser deposition. Epitaxial growth of oxide buffer layers directly on biaxially textured Ni, formed by recrystallization of cold-rolled pure...

We report on the growth mechanism of YBa2Cu3O7−x. Our study is based on the analysis of ultrathin, YBa2Cu3O7−x layers in c-axis oriented YBa2Cu3O7−x / PrBa2Cu3O7 superlattices. We have found that the release of epitaxial strain in very thin YBCO layers triggers a change in the dimensionality of the growth mode. Ultrathin, epitaxially strained, YBCO layers with thickness below 3 unit cells grow ...

The effect of the patterning process on the nonlinearity of the microwave surface resistance RS of YBCO thin films is investigated. With the use of a sapphire dielectric resonator and a stripline resonator, the microwave RS of YBCO thin films was measured before and after the patterning process, as a function of temperature and the rf peak magnetic field in the film. The microwave loss was also...

We use electromigration (EM) to tune the oxygen content of YBa$_2$Cu$_3$O$_{7-\delta}$ (YBCO) nanowi\-res. During EM, dopant atoms in nanowire are moved under combined effect electrostatic force and Joule heating. The EM current can be tuned either deplete or replenish nanowires with oxygen, allowing fine tuning its hole doping level. Electrical transport measurements Kelvin probe microscopy co...