<i>C</i>-Axis Oriented Y-Ba-Cu-O Oxide Superconductor

Composition of Pulsed-Laser-Deposited Y-Ba-Cu-O and Ba-K-Bi-O Thin Films

The composition of pulsed-laser-deposited Y-Ba-Cu-O and Ba-K-Bi-O thin films is shown to be strongly affected by target conditioning, gas pressure, and targetsubstrate distance. For both compounds, ablation from a freshly sanded target surface results in films with an excess of the more volatile elements. The concentration of these volatile elements in the films decreases until the system reach...

Nonequilibrium kinetic inductive response of Y–Ba–Cu–O photodetectors

We present a comprehensive study of the light-induced transient nonequilibrium kinetic inductive response of high-quality, epitaxial Y–Ba–Cu–O (YBCO) thin films. The test structures consisted of 20–30 μm wide coplanar strip (CPS) transmission lines with 7–10 μm separation, patterned in 100 nm thick YBCO films grown on MgO and LaAlO3 substrates. Each CPS structure contained a 5 μm wide, 7–10 μm ...

Praseodymium valency from crystal structure in Pr-Ba-Cu-O and (Y-Pr)-Ba-Cu-O single crystals

2014 The substitution of Pr to Y leads to materials with a general formula (Y1-vPrv)(Ba2-x’Prx’)(Cu3-y~y)O6+x’/ 2-y+z and with a structural transition around x = v + x’ ~ 0.5. For x ~ 0.5 the crystals are orthorhombic, Y-Ba-Cu-O type, but with a lowered distortion. For v ~ 0.5 the crystals are tetragonal, La1.5Ba1.5Cu3O7 ± z type, with the characteristic tri-twinning of this phase. The Pr valen...

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...

Raman detection of the superconducting gap in Ba-Y-Cu-O superconductors.