Pressure-induced phase separation in the Y123 superconductor

Calamiotou, M; Gantis, A; Lampakis, D; Siranidi, E; Liarokapis, E; Margiolaki, I; Conder, K

dc.contributor.author	Calamiotou, M	en
dc.contributor.author	Gantis, A	en
dc.contributor.author	Lampakis, D	en
dc.contributor.author	Siranidi, E	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Margiolaki, I	en
dc.contributor.author	Conder, K	en
dc.date.accessioned	2014-03-01T01:31:42Z
dc.date.available	2014-03-01T01:31:42Z
dc.date.issued	2009	en
dc.identifier.issn	0295-5075	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19893
dc.subject	Phase Separation	en
dc.subject	Superconductors	en
dc.subject.classification	Physics, Multidisciplinary	en
dc.subject.other	POWDER DIFFRACTION	en
dc.subject.other	CHARGE-TRANSFER	en
dc.subject.other	YBA2CU3O7	en
dc.subject.other	TRANSFORMATION	en
dc.subject.other	DISTORTIONS	en
dc.subject.other	TRANSITION	en
dc.title	Pressure-induced phase separation in the Y123 superconductor	en
heal.type	journalArticle	en
heal.identifier.primary	10.1209/0295-5075/85/26004	en
heal.identifier.secondary	http://dx.doi.org/10.1209/0295-5075/85/26004	en
heal.identifier.secondary	26004	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	We study the hydrostatic pressure dependence of the Y123 lattice by synchrotron angle-dispersive powder diffraction up to 12.7 GPa in order to detect any lattice instabilities or phase separation observed by Raman measurements. In the pressure range (3.7GPa< p < 10 GPa) mainly the c-axis (and to a smaller extend the a-, b-axis) undergoes a clear deviation from the expected equation of state. Upon the pressure release the data follow the anticipated dependence showing a strong hysteresis. At the pressure of similar to 3.7 GPa new peaks appear in the diffraction patterns, which can be attributed to another apparently coherent phase that exhibits enhanced disorder and texture effects. The intensity of the new peaks decreases with increasing pressure and upon pressure release they disappear for p< 3.9 GPa. The in-plane Cu-O-pl bonds, the Cu2-Cu1 distance and the fractional coordinate of Ba atom along the c-axis of the Y123 phase show modi. cations at characteristic pressures in complete agreement with the Raman measurements under pressure, strongly indicating a pressure-induced lattice instability and phase separation. Copyright (C) EPLA, 2009	en
heal.publisher	EDP SCIENCES S A	en
heal.journalName	EPL	en
dc.identifier.doi	10.1209/0295-5075/85/26004	en
dc.identifier.isi	ISI:000263692900024	en
dc.identifier.volume	85	en
dc.identifier.issue	2	en