Melt processing in the Y-Ba-Cu-O system.

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...

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...

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

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 ...

Properties of Mg-doped Nd-Ba-Cu-O generic seed crystals for the top seeded melt growth of (RE)-Ba-Cu-O bulk superconductors

We have recently developed a new generic seed crystal that has been used successfully to fabricate any oriented, single grain (RE)-Ba-Cu-O bulk superconductor by a cold seeding technique. In this paper we report the chemical, structural and microstructural properties of these seed crystals, including the variation of melting point, crystallographic parameters and volume fraction of Mg-rich incl...