Phase separation in oxygen deficient HoBa₂Cu₃O_7-δ single crystals: effect of high pressure and twin boundaries

Vovk, R. V.; Nazyrov, Z. F.; Obolenskii, M. A.; Goulatis, I. L.; Chroneos, A. and Pinto Simoes, V. M. (2011). Phase separation in oxygen deficient HoBa₂Cu₃O_7-δ single crystals: effect of high pressure and twin boundaries. Philosophical Magazine, 91(17) pp. 2291–2302.

DOI: https://doi.org/10.1080/14786435.2011.552893

Abstract

We investigate the influence of high hydrostatic pressure on the electrical resistance in the ab-plane in HoBa₂Cu₃O_7-δ single crystals with oxygen deficiency. It is determined that the high-pressure-induced redistribution of labile oxygen enhances 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. It is determined that the formation of the low-temperature phase can occur at the twin boundaries.

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