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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titlePhonon activity and intermediate glassy phase of YVO3pt_BR
dc.contributor.authorMassa, NEpt_BR
dc.contributor.authorPiamonteze, Cpt_BR
dc.contributor.authorTolentino, HCNpt_BR
dc.contributor.authorAlonso, JApt_BR
dc.contributor.authorMartinez-Lope, MJpt_BR
dc.contributor.authorCasais, MTpt_BR
unicamp.authorNatl Univ La Plata, Lab Nacl Invest, RA-1900 La Plata, Argentina Natl Univ La Plata, Ctr CEQUINOR, Serv Espectroscopia Opt, RA-1900 La Plata, Argentina Lab Nacl Luz Sincrotron, BR-13083970 Campinas, SP, Brazil Univ Estadual Campinas, Inst Fis, BR-13083970 Campinas, SP, Brazil CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spainpt_BR
dc.description.abstractWe show that in YVO3 additional hard phonons gradually become zone center infrared active below similar to210 K, verifying that a lattice phase transition takes place at about that temperature. Their gradual increment in intensity between similar to210 and similar to77 K is associated with a "glassy" behavior found in the temperature-dependent V K edge pseudoradial distribution. This translates into an increase in the Debye-Waller factors ascribed to the appearance of V local structural disorder below similar to150 K. Conflicts between various ordering mechanisms in YVO3 bring up similarities of the intermediate phase to known results in dielectric incommensurate systems, suggesting the formation of commensurate domains below 116 K, the onset temperature of G-type antiferromagnetism. We propose that similar to210 and similar to77 K be understood as the temperatures where the commensurate-incommensurate and incommensurate-commensurate "lock-in" phase transitions take place. We found support for this interpretation in the inverted lambda shapes of the measured heat capacity and in the overall temperature dependence of the hard
dc.relation.ispartofPhysical Review Bpt_BR
dc.relation.ispartofabbreviationPhys. Rev. Bpt_BR
dc.publisher.cityCollege Pkpt_BR
dc.publisherAmerican Physical Socpt_BR
dc.identifier.citationPhysical Review B. American Physical Soc, v. 69, n. 5, 2004.pt_BR
dc.sourceWeb of Sciencept_BR
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