Magnetic,electrical transport and electron spin resonance studies of Fe-doped manganite LaMn0.7Fe0.3O3+δ |
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| Authors: | X.J. Liu Z.Q. Li A. Yu M.L. Liu W.R. Li B.L. Li P. Wu H.L. Bai E.Y. Jiang |
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| Affiliation: | 1. Faculty of Science, Institute of Advanced Materials Physics, Tianjin University, Tianjin 300072, China;2. Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Tianjin University, Tianjin 300072, China;3. Central Laboratory, Nankai University, Tianjin 300071, China;4. Analysis Test Center, Jilin University, Changchun 130023, China |
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| Abstract: | We have investigated the magnetic, electrical transport and electron spin resonance (ESR) properties of polycrystalline Fe-doped manganite LaMn0.7Fe0.3O3+δ prepared by sol–gel method. A typical cluster-glass feature is presented by DC magnetization and AC susceptibility measurements and a sharp but shallow memory effect was observed. Symmetrical Lorentzian lines of the Mn/Fe spectra were detected above 120 K, where the sample is a paramagnetic (PM) insulator. When the temperature decreases from 120 K, magnetic clusters contributed from ferromagnetic (FM) interaction between Mn3+ and Mn3+/Fe3+ ions develop and coexist with PM phase. At lower temperature, these FM clusters compete with antiferromagnetic (AFM) ones between Fe3+ ions, which are associated with a distinct field-cooled (FC) effect in characteristic of cluster-glass state. |
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| Keywords: | 75.47.Lx 75.50.Lk 75.40.Gb 76.30.-v |
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