One of the most exciting cases of superconductivity suppression in high-Tc cuprates is that of RE1−xPrxBa2Cu3O7, where RE stands for a rare earth (see Refs. [1,2] for reviews). Even more exciting are indications that conductivity and superconductivity can be restored in stoichiometric PrBa2Cu3O7 [3,4]. This is such an unexpected result [5] that it is still not generally accepted and further exp...

in order to study some theories about nonsuperconductivity of prba2cu3o7, based on the density functional theory and with apw+lo/lapw method some calculations for prba2cu3o7 (pr123) and yba2cu3o7 (y123) were performed. the lsda+u approximation was used for pr(4f) orbitals and the effect of changing upr on the band structure, pr(4f)-dos, distribution of electrons on the planes and chains, and pr...

We report on the growth mechanism of YBa2Cu3O7−x. Our study is based on the analysis of ultrathin, YBa2Cu3O7−x layers in c-axis oriented YBa2Cu3O7−x / PrBa2Cu3O7 superlattices. We have found that the release of epitaxial strain in very thin YBCO layers triggers a change in the dimensionality of the growth mode. Ultrathin, epitaxially strained, YBCO layers with thickness below 3 unit cells grow ...

We describe the noise performance of dc SQUIDs fabricated with quasiplanar ramp-type Josephson junctions on the basis of c-axis-oriented YBa2Cu3O7 /PrBa2Cu3O7 thin-film heterostructures. The noise spectrum of the dc SQUIDs was measured with dcand ac-bias schemes at different temperatures and showed values below 10 F0 /Hz 1/2 down to frequencies of about 1 Hz at 70 K. Up to now for the magnetic ...