Sr Substitution Effect in Ba-Y-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...

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 ...

Pyroelectric effect in Y–Ba–Cu–O thin films under laser illumination

The thermoelectric response of amorphous, semiconducting Y–Ba–Cu–O thin films was investigated by illumination with 150 ps optical pulses at 1064 nm and with a continuous wave at 493 nm ~argon laser!. The measured unbiased voltage response was consistent with pyroelectricity. At high pulse energies, the voltage response saturated due to the saturation of the spontaneous polarization. The pulsed...

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