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Spin-glass-like behaviour in IrSr2RECu2O8 (RE=Sm and Eu)
Authors:A.J. Dos santos-Garcí  a,J. Van Duijn,M.Á  . Alario-Franco
Affiliation:Laboratorio Complutense de Altas Presiones, Departamento de Química Inorgánica, Facultad de Química, Universidad Complutense de Madrid, Spain
Abstract:We report the results of magnetic and specific heat measurements on the 1212-type compounds IrSr2RECu2O8 with RE=Sm and Eu, prepared by high-pressure and high-temperature synthesis. The magnetic susceptibility of these compounds shows a large difference in the temperature dependence of the magnetization measured under zero-field-cooled and field-cooled conditions below 87 and 71 K, respectively, and upon further cooling below ∼10 K substantial maxima are observed too. Further AC susceptibility measurements support a glassy behaviour in lower magnetic transitions whereas the specific heat measurements do not show the typical long-range ordering commonly displayed in ferro, ferri or antiferromagnetic transitions. Hysteresis loops suggest the presence of magnetic clusters in the otherwise paramagnetic zone, indicating that these compounds probably display a reentrant spin-glass transition. Results are presented and discussed.
Keywords:Iridocuprate   Microstructure   Spin-glass   Reentrant spin-glass   1212 cuprates
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