Micro-Raman and infrared study of NdFeAsO0.85

Siranidi, E; Lampakis, D; Liarokapis, E; Dohcevic-Mitrovic, Z; Paunovic, N; Popovic, ZV; Zhao, ZX

dc.contributor.author	Siranidi, E	en
dc.contributor.author	Lampakis, D	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Dohcevic-Mitrovic, Z	en
dc.contributor.author	Paunovic, N	en
dc.contributor.author	Popovic, ZV	en
dc.contributor.author	Zhao, ZX	en
dc.date.accessioned	2014-03-01T01:31:06Z
dc.date.available	2014-03-01T01:31:06Z
dc.date.issued	2009	en
dc.identifier.issn	0925-8388	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19741
dc.subject	High Tc-superconductors	en
dc.subject	Oxypnictides	en
dc.subject	Phonons	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.subject.other	Arsenic oxide	en
dc.subject.other	Asymmetric peak	en
dc.subject.other	Far infrared	en
dc.subject.other	High quality	en
dc.subject.other	High T <sub>c</sub>-superconductors	en
dc.subject.other	Infrared measurements	en
dc.subject.other	IR spectrum	en
dc.subject.other	Iron-based	en
dc.subject.other	Low temperatures	en
dc.subject.other	Micro-Raman	en
dc.subject.other	Micro-Raman spectra	en
dc.subject.other	Oxypnictides	en
dc.subject.other	Phonon mode	en
dc.subject.other	Room temperature	en
dc.subject.other	Superconducting transitions	en
dc.subject.other	Temperature dependence	en
dc.subject.other	Arsenic	en
dc.subject.other	Phonons	en
dc.subject.other	Raman spectroscopy	en
dc.subject.other	Superconducting materials	en
dc.subject.other	Superconductivity	en
dc.subject.other	Infrared spectroscopy	en
dc.title	Micro-Raman and infrared study of NdFeAsO0.85	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jallcom.2009.07.157	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jallcom.2009.07.157	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	We report micro-Raman and infrared measurements on high quality iron-based arsenic oxide, at low temperatures (down to 20 K). Micro-Raman spectra exhibit two asymmetric peaks related to four phonon modes of As, Fe at similar to 160 cm(-1), of Nd at similar to 169 cm(-1), of As at similar to 203 cm(-1) and of Fe at similar to 214 cm(-1). No phonon anomaly has been observed at the superconducting transition. Far infrared reflectance measurements were performed at low temperatures, down to 77 K. In the far IR spectra obtained at room temperature, there are two strong peaks at about similar to 105 cm(-1) (13 meV),and similar to 446 cm(-1) (55 meV) and one weaker structure around similar to 270 cm(-1) (33.4 meV). The assignment of the observed modes has been done. Additionally, a band at similar to 494 cm(-1) and for temperatures below 230 K a peak at similar to 200 cm(-1) were observed. The temperature dependence of these modes reveals an unconventional behavior of the IR modes not reported before. (C) 2009 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Journal of Alloys and Compounds	en
dc.identifier.doi	10.1016/j.jallcom.2009.07.157	en
dc.identifier.isi	ISI:000272521900087	en
dc.identifier.volume	487	en
dc.identifier.issue	1-2	en
dc.identifier.spage	430	en
dc.identifier.epage	433	en