Structural study, resistivity, magnetization and Raman measurements for the HTc superconducting compounds SmBa2-xSrxCu3O6+y (x = 0.0, 0.25, 0.5, 0.75, 1.0 and 1.25)

Psycharis, V; Mitros, C; Koufoudakis, A; Gamari-Seale, H; Niarchos, D; Kalitsounakis, N; Poulakis, N; Palles, D; Liarokapis, E

dc.contributor.author	Psycharis, V	en
dc.contributor.author	Mitros, C	en
dc.contributor.author	Koufoudakis, A	en
dc.contributor.author	Gamari-Seale, H	en
dc.contributor.author	Niarchos, D	en
dc.contributor.author	Kalitsounakis, N	en
dc.contributor.author	Poulakis, N	en
dc.contributor.author	Palles, D	en
dc.contributor.author	Liarokapis, E	en
dc.date.accessioned	2014-03-01T01:12:19Z
dc.date.available	2014-03-01T01:12:19Z
dc.date.issued	1996	en
dc.identifier.issn	0921-4534	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12061
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0030213499&partnerID=40&md5=5023e60e499a6e1c7a556cc8c33c445c	en
dc.subject	Charge redistribution	en
dc.subject	O-T transition	en
dc.subject	Raman scattering	en
dc.subject	SmBa2-xSrxCu3Q6+y	en
dc.subject	HTc-superconductors	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	Electric charge	en
dc.subject.other	Electric conductivity measurement	en
dc.subject.other	Electrons	en
dc.subject.other	Magnetization	en
dc.subject.other	Molecular structure	en
dc.subject.other	Physical properties	en
dc.subject.other	Raman scattering	en
dc.subject.other	Samarium compounds	en
dc.subject.other	Spectroscopic analysis	en
dc.subject.other	Stress relaxation	en
dc.subject.other	Substitution reactions	en
dc.subject.other	X ray diffraction analysis	en
dc.subject.other	Copper superconducting planes	en
dc.subject.other	Deoxygenated compounds	en
dc.subject.other	Oxygenated compounds	en
dc.subject.other	Rietveld analysis	en
dc.subject.other	Samarium barium strontium copper oxide	en
dc.subject.other	Stress relaxation models	en
dc.subject.other	Tetragonal symmetry	en
dc.subject.other	High temperature superconductors	en
dc.title	Structural study, resistivity, magnetization and Raman measurements for the HTc superconducting compounds SmBa2-xSrxCu3O6+y (x = 0.0, 0.25, 0.5, 0.75, 1.0 and 1.25)	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1996	en
heal.abstract	The structure and the physical properties of the oxygenated and deoxygenated compounds of the series SmBa2-xSrxCu3O6+y (x = 0.0, 0.25, 0.5, 0.75, 1.0 and 1.25) are studied. In the XRD spectra of the oxygenated compounds a structure of tetragonal symmetry is revealed beyond the value of x = 0.75 and the upper limit for substitution of Sr for Ba is x = 1.0. Resistivity and magnetization measurements of the fully oxygenated compounds show that the Tc values decrease with increasing Sr content and this is discussed in relation to the observed structural changes deduced by the Rietveld analysis of the XRD spectra. The bond length changes that occur in the coordination sphere of Cu(1), Cu(2) and (Ba,Sr) atoms are consistent with the ""charge redistribution"" model, i.e., electrons are transferred from Cu(2) to Cu(1) atoms and the number of holes on the ""Cu(2) superconducting planes"" increases beyond the optimum value inducing a reduction in the Tc. The Raman measurements support the charge redistribution and the stress relaxation models as probable explanations for the reduction of Tc upon Sr substitution.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Physica C: Superconductivity and its Applications	en
dc.identifier.isi	ISI:A1996VE49700003	en
dc.identifier.volume	267	en
dc.identifier.issue	3-4	en
dc.identifier.spage	211	en
dc.identifier.epage	224	en