R-M interactions in R₂BaMO₅ (R=Y or Gd and M=Cu or Zn)

R₂BaMO₅ (R = Gd or Y; M = Cu or Zn) oxides have been studied using the specific heat, DC magnetic susceptibility and electron paramagnetic resonsance (EPR). For one member of the series without a magnetic moment at M, namely Gd₂BaZnO₅, measurements reveal long-range antiferromagnetic order at T<s...

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Detalles Bibliográficos
Autores principales: Goya, Gerardo Fabián, Mercader, Roberto Carlos, Steren, L. B., Sánchez, Rodolfo D., Causa, M. T., Tovar, M.
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 1996
Materias:
Ciencias Exactas
Física
Oxides
Specific heat
DC magnetic susceptibility
Electron Paramagnetic Resonsance (EPR)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123327
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123327
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
Oxides
Specific heat
DC magnetic susceptibility
Electron Paramagnetic Resonsance (EPR)
spellingShingle Ciencias Exactas
Física
Oxides
Specific heat
DC magnetic susceptibility
Electron Paramagnetic Resonsance (EPR)
Goya, Gerardo Fabián
Mercader, Roberto Carlos
Steren, L. B.
Sánchez, Rodolfo D.
Causa, M. T.
Tovar, M.
R-M interactions in R₂BaMO₅ (R=Y or Gd and M=Cu or Zn)
topic_facet Ciencias Exactas
Física
Oxides
Specific heat
DC magnetic susceptibility
Electron Paramagnetic Resonsance (EPR)
description R₂BaMO₅ (R = Gd or Y; M = Cu or Zn) oxides have been studied using the specific heat, DC magnetic susceptibility and electron paramagnetic resonsance (EPR). For one member of the series without a magnetic moment at M, namely Gd₂BaZnO₅, measurements reveal long-range antiferromagnetic order at T<sub>N</sub>(Gd₂BaZnO₅) = 2.3 ± 0.1 K, much lower than the Curie - Weiss temperature Θ of 15.9 ± 0.3 K. This indicates the existence of competing interactions that introduce a large degree of magnetic frustration in the system. For Y₂BaCuO₅ the Cu - Cu interactions are responsible for the broad maximum in the magnetic contribution to the specific heat centred at 18.5 ± 0.01 K that stretches beyond the instrumental limit of 25 K. The strong Cu - Cu interactions also present in Gd₂BaCuO₅, combined with the Gd - Cu interaction, polarize the Gd sublattice, giving measurable contributions to the specific heat in the same temperature range. In addition, they broaden the Gd EPR line and saturate its integrated intensity. The ordering temperature of Gd ions is raised to T<sub>N</sub>(Gd₂BaCuO₅) = 12.0 ± 0.1 K.
format Articulo
Preprint
author Goya, Gerardo Fabián
Mercader, Roberto Carlos
Steren, L. B.
Sánchez, Rodolfo D.
Causa, M. T.
Tovar, M.
author_facet Goya, Gerardo Fabián
Mercader, Roberto Carlos
Steren, L. B.
Sánchez, Rodolfo D.
Causa, M. T.
Tovar, M.
author_sort Goya, Gerardo Fabián
title R-M interactions in R₂BaMO₅ (R=Y or Gd and M=Cu or Zn)
title_short R-M interactions in R₂BaMO₅ (R=Y or Gd and M=Cu or Zn)
title_full R-M interactions in R₂BaMO₅ (R=Y or Gd and M=Cu or Zn)
title_fullStr R-M interactions in R₂BaMO₅ (R=Y or Gd and M=Cu or Zn)
title_full_unstemmed R-M interactions in R₂BaMO₅ (R=Y or Gd and M=Cu or Zn)
title_sort r-m interactions in r₂bamo₅ (r=y or gd and m=cu or zn)
publishDate 1996
url http://sedici.unlp.edu.ar/handle/10915/123327
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