Superconducting transitions of Y-123/Ba-Ca-Cu-O/Y-123 layered structure

EXAFS study of Tl 0 . 75 Cu . 25 Ba 2 Ca 3 Cu 4 O y and Cu 0 . 68 C . 32 Ba 2 Ca 3 Cu 4 O y superconductors [ bulk ] at 300

The results of EXAFS measurements at 300 K for the superconducting compounds Tl0.75Cu0.25Ba2Ca3Cu4Oy [Tl-1234], TlBa2Ca3Cu4Oy [Tl-1212], and CuBa2Ca3Cu4Oy [Cu-1234]. are reported. We have measured the EXAFS spectrum for Tl0.75Cu0.25Ba2Ca3Cu4Oy in the range 10K-300K, however here we limit our discussion to the spectrum at 300 K. This material is prepared under high pressure [3.5 GPa] from precur...

Crystal Structure of the Superconducting Layered Cobaltate Na X Coo 2 ·yd 2 O Crystal Structure of the Superconducting Layered Cobaltate Na X Coo 2 ·yd 2 O

We have used electron diffraction and neutron powder diffraction to elucidate the structural properties of superconducting Na x CoO 2 ·yD 2 O over a wide compositional range. Our measurements show that superconducting samples exhibit a number of supercells ranging from 1 3 a * to 1 15 a * , but the predominant modulation, observed also in the neutron data, is a double hexagonal cell with dimens...

Superconducting and structural properties of plasma sprayed Y-Ba-Cu-O layers deposited on metallic substrates*

The properties of plasma sprayed Y-Ba-Cu-O coatings deposited on metallic substrates are studied. Stainless steel, nickel steels and pure nickel are used as substrate. Y-Ba-Cu-O deposited on stainless steel and nickel steel reacts with the substrate. This interaction can be suppressed by using an yttria-stabilized zirconia (YsZ) diffusion barrier. However, after heat treatment the Y-Ba-Cu-O lay...

Intrinsic picosecond response times of Y–Ba–Cu–O superconducting photodetectors

We report our femtosecond time-resolved measurements on the photoresponse of an epitaxial YBa2Cu3O72x ~YBCO! thin-film photodetector, patterned into a microbridge geometry. By varying the current–voltage biasing conditions between the superconducting and resistive ~hot spot! states, we observed transients that correspond to the nonequilibrium kinetic-inductance and the nonequilibrium electron-h...

Antiphase domain boundaries in the superconducting phase of the Y-Ba-Cu-O system.