Disorder-driven phase transition in La{sub 0.37}D{sub 0.30}Ca{sub 0.33}MnO{sub 3} (D = Bi, Sm) manganites
In the present work we report the structural, electron spin resonance (ESR) and magnetic properties of La{sub 0.37}D{sub 0.30}Ca{sub 0.33}MnO{sub 3} (D = Bi, Sm) manganites synthesized by sol-gel method. The critical behavior at the critical point, where the system undergoes phase transition from paramagnetic (PM) to ferromagnetic (FM) state, is investigated by using modified-Arrott plots, Kouvel-Fisher method and critical isotherm analysis. Both the samples show second-order phase transition near the critical point. The decrease in magnetization (M), Curie temperature (T{sub C}), evolution of spin or cluster glass behavior and the nature of second-order phase transition compared to the first-order transition reported in the literature for La{sub 0.67}Ca{sub 0.33}MnO{sub 3} are ascribed to disorder caused by the size mismatch of the A-site cations with Bi and Sm doping at La-site.
- OSTI ID:
- 22492289
- Journal Information:
- AIP Advances, Vol. 5, Issue 8; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
- Country of Publication:
- United States
- Language:
- English
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