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Lattice anomalies in the oxygen deficient NdFeAsO superconductor

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dc.contributor.author Calamiotou, M en
dc.contributor.author Margiolaki, I en
dc.contributor.author Ren, ZA en
dc.contributor.author Zhao, ZX en
dc.contributor.author Siranidi, E en
dc.contributor.author Liarokapis, E en
dc.date.accessioned 2014-03-01T01:35:55Z
dc.date.available 2014-03-01T01:35:55Z
dc.date.issued 2011 en
dc.identifier.issn 1557-1939 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/21249
dc.subject Lattice effects en
dc.subject Oxypnictides en
dc.subject Structural anomalies en
dc.subject Superconductivity en
dc.subject.classification Physics, Applied en
dc.subject.classification Physics, Condensed Matter en
dc.subject.other Gradual modifications en
dc.subject.other High resolution en
dc.subject.other Lattice anomaly en
dc.subject.other Lattice effect en
dc.subject.other Low temperatures en
dc.subject.other NdFeAsO en
dc.subject.other Oxygen deficient en
dc.subject.other Oxypnictides en
dc.subject.other Spectroscopic studies en
dc.subject.other Structural anomalies en
dc.subject.other Structural change en
dc.subject.other Structural modifications en
dc.subject.other Structural phase transition en
dc.subject.other Superconducting layer en
dc.subject.other Synchrotron X ray powder diffraction en
dc.subject.other Transition temperature en
dc.subject.other Oxygen en
dc.subject.other Spectroscopic analysis en
dc.subject.other Superconducting materials en
dc.subject.other X ray powder diffraction en
dc.subject.other Superconductivity en
dc.title Lattice anomalies in the oxygen deficient NdFeAsO superconductor en
heal.type journalArticle en
heal.identifier.primary 10.1007/s10948-010-1105-1 en
heal.identifier.secondary http://dx.doi.org/10.1007/s10948-010-1105-1 en
heal.language English en
heal.publicationDate 2011 en
heal.abstract We compare the results of high-resolution synchrotron X-ray powder diffraction with low-temperature spectroscopic studies on the oxygen deficient NdFeAsO0.85 superconductor. IR results indicate that a certain mode related to vibrations of the As ions softens at low temperatures. By employing a dense temperature sampling we have managed to reveal unnoticed structural modifications that start around ∼180 K, as the anomaly of the IR mode, and disappear at the transition temperature. The data show smaller structural changes in the Nd-O charge reservoir layer, while in the superconducting layer the FeAs4 tetrahedron shows gradual modifications below ∼180 K, which peak around 140 K and then suddenly disappear at Tc . The observed lattice anomalies are not connected with a structural phase transition or an AF ordering; they are more evident in the superconducting Fe-As planes, and disappear across Tc, pointing to a connection to superconductivity. © 2010 Springer Science+Business Media, LLC. en
heal.publisher SPRINGER en
heal.journalName Journal of Superconductivity and Novel Magnetism en
dc.identifier.doi 10.1007/s10948-010-1105-1 en
dc.identifier.isi ISI:000289488800014 en
dc.identifier.volume 24 en
dc.identifier.issue 3 en
dc.identifier.spage 1181 en
dc.identifier.epage 1184 en


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