Hydrostatic-pressure-induced phase separation in the YBa2Cu4O8 superconductor

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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 PHONON RAMAN-SCATTERING en
dc.subject.other WIGNER POLARON CRYSTAL 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

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