Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/100958
Type: Artigo de periódico
Title: Phonon Raman Scattering In A2mn2o7 (a=tl,in,y)
Author: Granado E.
Pagliuso P.G.
Sanjurjo J.A.
Rettori C.
Subramanian M.A.
Cheong S.-W.
Oseroff S.B.
Abstract: Raman scattering of optical phonons in polycrystalline A2Mn2O7 (A=Y, In, and Tl) are reported as a function of temperature. For A=In and Tl a hardening of the two lowest energy modes is observed below Tc that we associate to a phonon modulation of the exchange interaction. These data suggest superexchange as the mechanism responsible for magnetic ordering in these systems. All but one of the Raman modes in the In- and Tl-based compounds appear at lower frequencies when compared with those in the Y-based one. This frequency shift may be due to the strong hybridization of the Tl(In) 6s(5s) orbital with O 2p and Mn 3d, claimed by recent band-structure calculations on these materials. ©1999 The American Physical Society.
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Rights: aberto
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Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0000238544&partnerID=40&md5=f3ed8c482c017e2a5d2914b9938386c9
Date Issue: 1999
Appears in Collections:Unicamp - Artigos e Outros Documentos

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