BaHfO3 (BHO) has been proposed as a new cap layer material for YBa2Cu3O7-δ (YBCO) coated conductors. Highly c-axis oriented BHO cap layer has been deposited on ion-beam assisted deposition-MgO buffered Hastelloy tapes by direct-current-magnetron sputtering method. The epi-growth of BHO films combined with its properties is investigated in details. The degenerated cubic crystal structure of BHO ...

Type II superconductors will be considered as macroscopic quantum gravitational antennas, which can simultaneously also be used as efficient transducers for converting electromagnetic radiation into gravitational radiation, and vice versa. A Meissner-like effect, in which the LenseThirring field associated with a gravity wave is expelled from the interior of the superconductor, is predicted. An...

We have designed low noise temperature sensing and control units with the objective of using them for the fabrication of far infrared active cavity radiometers. The sensing unit, first characterized at 300 K using industrial platinium resistance thermometers, has a noise level of ∼ 25− 30 μKeff for a 3 hours measuring time and in a 1 Hz bandwidth. Using YBCO superconducting thermometers, the no...

Abstract It has been proposed by Müller and Shengelaya that underdoped ultrathin layers of copper-oxide high-temperature superconductors (HTSs) sandwiched between high-dielectric-constant insulator could manifest increased superconducting critical temperature $$T_c$$ T c </mml:math...

High quality c^-axis oriented thin and ultra-thin films have been grown in situ on (100) surfaces of ZrO?, SrTiO, and MgO. Sharp transitions were observed with T,,,,,, of 87-91 K for films thicker than 70 A. On atomically polished MgO substrates films as thin as 15 A revealed a full transition to superconductivity above 45.5 K. The critical current density at 77 K was found to be strongly depen...

We report a detailed study of the grain orientations and grain boundary (GB) networks in Y2O3 films grown on Ni-5 at.%W substrates. Electron back scatter diffraction (EBSD) exhibited different GB misorientation angle distributions, strongly decided by Y2O3 films with different textures. The subsequent yttria-stabilized zirconia (YSZ) barrier and CeO2 cap layer were deposited on Y2O3 layers by r...

Motivated by recent pump-probe experiments indicating enhanced coherent c-axis transport in underdoped YBCO, we study Josephson junctions periodically driven by optical pulses. We propose a mechanism for this observation by demonstrating that a parametrically driven Josephson junction shows an enhanced imaginary part of the low-frequency conductivity when the driving frequency is above the plas...

A very smooth surface film of c-axis oriented Y B a z C w G (YBCO) with roughness of less than monomolecular layer over lOpmxlO~rn, free of precipitates, has been obtained by atomic layer-by-layer metalorganic chemical vapor deposition (MOCVD) on a SrTi03 substrate at 650°C. A very large terrace length of 0.3-0.5pm may be due to the enhanced migration of growing species on the surface. The resu...