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|Type:||Artigo de periódico|
|Title:||Magnetic Properties Of The Rusr2ln1.5ce 0.5cu2o 10-δ (ln=y, Ho And Dy) And Rusr2ycu2o 8-δ Rutheno-cuprate Families: A Comparative Study|
De Lima O.F.
|Abstract:||The magnetic behavior of polycrystalline samples of the magneto-superconductors RuSr2Ln1.5Ce0.5Cu 2O10-δ (LnRu-1222, Ln=Y, Ho and Dy) and RuSr 2YCu2O8-δ (YRu-1212) is analyzed and compared. Clear evidences for the occurrence of a spin glass phase on all LnRu-1222 samples are provided by ac susceptibility (χac) and dc magnetization measurements. A frequency-dependent peak in χac vs. T measurements, at low magnetic field, is observed. The strong suppression of this peak in the presence of magnetic fields as low as 500 Oe, as well as the results of thermoremanent magnetization (TRM) and isothermal remanent magnetization (IRM) measurements, suggest a spin glass behavior. Interestingly, the same measurements on the YRu-1212 sample show no indication of glassy behavior, contrasting with the results for LnRu-1222. We suggest that frustration of the Ru magnetic moments due to the presence of oxygen vacancies would be favored only in the LnRu-1222 compounds, thus causing the glassy behavior. This idea is supported by the observation of large oxygen deficiency that affects the RuO2 planes in Ru-1222, but does not occur in Ru-1212. © 2004 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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