Structural first-order transformation in La2/3Ba1/3MnO3: ESR study |
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Authors: | D.M. Polishchuk,A.I. Tovstolytkin,Elena Fertman,Vladimir Desnenko,Anatoly Beznosov,Marcela Kajňaková ,Alexander Feher |
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Affiliation: | 1. Institute of Magnetism, 36b Vernadsky Boulevard, Kyiv 03142, Ukraine;2. B. Verkin Institute for Low Temperature Physics and Engineering NASU, Department of Optical and Magnetic Properties of Solids, 47 Lenin Ave., Kharkov 61103, Ukraine;3. P.J. Šafárik University in Košice, Faculty of Science, Park Angelinum 9, 04154 Košice, Slovakia |
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Abstract: | We have studied by the electron-spin resonance (ESR) and static magnetic field techniques, the La2/3Ba1/3MnO3 perovskite, which was previously shown to exhibit a martensitic phase transformation in the vicinity of Ts∼200 K [Physical Review B 68, 054109 (2003)], leading to its structural phase-segregated state. Resonant absorptions reveal that in the temperature interval from 100 K to 340 K the compound represents a mixture of two ferromagnetic phases possessing different magnetizations, in varying proportions depending on the temperature, and a small amount of a paramagnetic phase. The results agree well with the previous neutron diffraction study. Applied in the ESR experiments, magnetic fields (2–6 kOe) strongly affect the magnetization curves: even magnetic field as high as 700 Oe modifies the anomaly in the phase transformation region and removes the difference between the zero-field cooled and field-cooled magnetization curves, which implies that the difference in the magnetic susceptibility of the coexisting phases is small and the magnetic domain configuration can be easily changed. |
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Keywords: | Manganite Phase separation Martensite Static magnetization Electron-spin resonance |
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