Phase separation in oxygen deficient ΗοBa2Cu3O7-δ single crystals: effect of high pressure and twin boundaries

Ruslan V Vovk (1) , Zarif F Nazyrov (1) , Mikhail A Obolenskii (1) , Yannis L Goulatis (1) , Alexander Chroneos (2) , Vitor M Pinto Simoes (3)

1 Kharkov National University
2 Imperial Collge
3 IPA - Instituto Superior Autónomo de Estudos Politécnicos

We investigate the influence of high hydrostatic pressure on the electrical resistance in the ab-plane in НоBa2Cu3O7-δ single crystals with oxygen deficiency. It is determined that the high-pressure induced redistribution of the labile oxygen enhances the phase separation, which is accompanied by structural relaxation and ascending diffusion within the volume of the sample. This results in a significant displacement of the temperature intervals that correspond to metal-to-dielectric type transitions and the realization of a pseudo-gap anomaly regime. It is determined that the formation of the low-temperature phase can occur at the twin boundaries.

Mots clés: Physical Sciences

Domaines: Matière Condensée [cond-mat]

Ruslan V Vovk, Zarif F Nazyrov, Mikhail A Obolenskii, Yannis L Goulatis, Alexander Chroneos, et al.. Phase separation in oxygen deficient ΗοBa2Cu3O7-δ single crystals: effect of high pressure and twin boundaries. Philosophical Magazine, 2011, pp.1. ⟨10.1080/14786435.2011.552893⟩. ⟨hal-00671638⟩