Anharmonicity and weak mode assignment in La2-xSr xCuO4 with oxygen isotopic substitution

Siranidi, E; Lampakis, D; Palles, D; Liarokapis, E; Conder, K

dc.contributor.author	Siranidi, E	en
dc.contributor.author	Lampakis, D	en
dc.contributor.author	Palles, D	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Conder, K	en
dc.date.accessioned	2014-03-01T02:44:28Z
dc.date.available	2014-03-01T02:44:28Z
dc.date.issued	2007	en
dc.identifier.issn	0587-4246	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/31833
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-33847287852&partnerID=40&md5=25b3a379a2e21be10b5ca2b17b0bf16d	en
dc.subject.classification	Physics, Multidisciplinary	en
dc.subject.other	Antiferromagnetism	en
dc.subject.other	Oxygen	en
dc.subject.other	Phase transitions	en
dc.subject.other	Polycrystalline materials	en
dc.subject.other	Raman scattering	en
dc.subject.other	Anharmonicity	en
dc.subject.other	Antiferromagnetic phase	en
dc.subject.other	Mass harmonic law	en
dc.subject.other	Oxygen isotopic substitution	en
dc.subject.other	Weak mode assignment	en
dc.subject.other	Lanthanum compounds	en
dc.title	Anharmonicity and weak mode assignment in La2-xSr xCuO4 with oxygen isotopic substitution	en
heal.type	conferenceItem	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	The oxygen isotope effect on the first- and second-order Raman active modes of high-quality (La2-xSrxCuO4)-O-16 18 (80% substitution O-16 by O-18) polycrystalline compounds with x = 0.00, 0.015 was investigated at low temperatures. In the second-order Raman scattering several weak and strong peaks were observed and assigned to oxygen atom vibrations. With the isotopic substitution the apex oxygen mode follows quite well the mass harmonic law at all temperatures studied, while the soft mode is anharmonic in the temperature range of 77-180 K and for higher temperatures its anharmonicity is strongly increased. The temperature dependence of the energy of the soft mode for x = 0.0 shows also a modification at approximate to 180 K and an abnormal behaviour at 280 K, which may be related with the transition to the antiferromagnetic phase.	en
heal.publisher	POLISH ACAD SCIENCES INST PHYSICS	en
heal.journalName	Acta Physica Polonica A	en
dc.identifier.isi	ISI:000244272200024	en
dc.identifier.volume	111	en
dc.identifier.issue	1	en
dc.identifier.spage	173	en
dc.identifier.epage	177	en