Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/59514
Type: Artigo de periódico
Title: Phonon activity and intermediate glassy phase of YVO3
Author: Massa, NE
Piamonteze, C
Tolentino, HCN
Alonso, JA
Martinez-Lope, MJ
Casais, MT
Abstract: We 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 phonons.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.69.054111
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File Description SizeFormat 
WOS000220001700027.pdf89.58 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.