Hydrostatic-pressure-induced phase separation in the YBa2Cu4O8 superconductor

Lampakis, D; Palles, D; Liarokapis, E; Kazakov, SM; Karpinski, J

dc.contributor.author	Lampakis, D	en
dc.contributor.author	Palles, D	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Kazakov, SM	en
dc.contributor.author	Karpinski, J	en
dc.date.accessioned	2014-03-01T01:22:29Z
dc.date.available	2014-03-01T01:22:29Z
dc.date.issued	2005	en
dc.identifier.issn	1098-0121	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16585
dc.subject	Hydrostatic Pressure	en
dc.subject	Phase Separation	en
dc.subject	Superconductors	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	HIGH-TC SUPERCONDUCTIVITY	en
dc.subject.other	PHONON RAMAN-SCATTERING	en
dc.subject.other	WIGNER POLARON CRYSTAL	en
dc.subject.other	CUPRATE SUPERCONDUCTORS	en
dc.subject.other	MODULATED STRUCTURE	en
dc.subject.other	SINGLE-CRYSTALS	en
dc.subject.other	STRUCTURAL ANOMALIES	en
dc.subject.other	CHARGE-TRANSFER	en
dc.subject.other	CUO2 PLANE	en
dc.subject.other	DEPENDENCE	en
dc.title	Hydrostatic-pressure-induced phase separation in the YBa2Cu4O8 superconductor	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevB.72.014539	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevB.72.014539	en
heal.identifier.secondary	014539	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	A micro-Raman study under high hydrostatic pressure (up to ∼7.5GPa) has been carried out on YBa2Cu4O8 superconducting single crystals at room and low temperatures down to 77K. Seven strong modes of Ag symmetry, two of weak B2g and B3g symmetry, and another mode at ∼431cm-1 have been investigated. With increasing hydrostatic pressure the first nine phonons shift to higher energies while the latter is independent of pressure. A splitting of the mode attributed to the in-phase vibrations of the plane O oxygen atoms has been observed. Besides, anomalous nonlinear pressure behavior has been observed for the other Ag phonons, which is correlated with the splitting of the in-phase mode and the pressure dependence of the superconducting transition temperature of this compound. The results indicate a pressure-induced phase separation, which is related with a lattice distortion from the tilting of the CuO6 octahedra. © 2005 The American Physical Society.	en
heal.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	Physical Review B - Condensed Matter and Materials Physics	en
dc.identifier.doi	10.1103/PhysRevB.72.014539	en
dc.identifier.isi	ISI:000230889800194	en
dc.identifier.volume	72	en
dc.identifier.issue	1	en