Spin-glass-like behaviour in IrSr2RECu2O8 (RE=Sm and Eu)
| Autor: | J. van Duijn, M.A. Alario-Franco, A. J. Dos Santos-Garcia |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Spin glass
Condensed matter physics Chemistry Condensed Matter Physics Magnetic susceptibility Electronic Optical and Magnetic Materials Inorganic Chemistry Magnetization Paramagnetism Ferromagnetism Spin crossover Materials Chemistry Ceramics and Composites Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Physical and Theoretical Chemistry Perovskite (structure) |
| Zdroj: | Journal of Solid State Chemistry. 181:3317-3321 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2008.09.005 |
| Popis: | We report the results of magnetic and specific heat measurements on the 1212-type compounds IrSr{sub 2}RECu{sub 2}O{sub 8} 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 {approx}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. - Graphical abstract: IrSr{sub 2}RECu{sub 2}O{sub 8} with RE=Sm and Eu were prepared by high-pressure and high-temperature synthesis. Both samples adopt a M-1212-type perovskite structure and a microdomain texturing of the long c-axis is observed by TEM. A very interesting magnetic behaviour is observed in these materials. A 'cluster by cluster freezing' model is proposed, instead of the classical individual spin freezing one to explain the spin-glass-like behaviour that seems tomore » coexist with weak ferromagnetism in both compounds.« less |
| Databáze: | OpenAIRE |
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