TEMPERATURE-INDUCED STRUCTURAL PHASE-TRANSITION IN CABR2 STUDIED BY RAMAN-SPECTROSCOPY - REPLY

RAPTIS, C; MCGREEVY, RL

dc.contributor.author	RAPTIS, C	en
dc.contributor.author	MCGREEVY, RL	en
dc.date.accessioned	2014-03-01T11:45:30Z
dc.date.available	2014-03-01T11:45:30Z
dc.date.issued	1991	en
dc.identifier.issn	0163-1829	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/37454
dc.subject.classification	Physics, Condensed Matter	en
dc.title	TEMPERATURE-INDUCED STRUCTURAL PHASE-TRANSITION IN CABR2 STUDIED BY RAMAN-SPECTROSCOPY - REPLY	en
heal.type	other	en
heal.language	English	en
heal.publicationDate	1991	en
heal.abstract	It has been established by the Raman studies of Raptis, McGreevy, and Sequier [Phys. Rev. B 39, 7996 (1989)], and Hahn and Unruh (preceding paper [Phys. Rev. B 43, 12 665 (1991)]) that CaBr2 undergoes a temperature-induced second-order phase transition (D2h --> D4h) associated with a soft mode of the lower-symmetry phase. In our studies, detailed high-resolution Raman measurements (down to a low-frequency limit of 10 cm-1) in CaBr2 and its isomorphous CaCl2 over wide temperature ranges (especially in the case of CaCl2) above T(c) have not revealed any soft-mode behavior, implying that the soft mode is Raman inactive in the higher-symmetry phase. This experimental evidence justifies, on the whole, the assignment of Raman modes made by Raptis, McGreevy, and Seguier, which has been partly disputed by Hahn and Unruh.	en
heal.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	PHYSICAL REVIEW B	en
dc.identifier.isi	ISI:A1991FM82300067	en
dc.identifier.volume	43	en
dc.identifier.issue	15	en
dc.identifier.spage	12668	en
dc.identifier.epage	12669	en