Magnetic properties and magnetocaloric effect of Sr-doped Pr0.7Ca0.3MnO3 compounds |
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| Institution: | 1. Department of Physics, Chungbuk National University, Cheongju, 28644, South Korea;2. Institute of Materials Science, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, Vietnam;3. Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, Vietnam;4. Department of Physics and Technology, Thai Nguyen University of Science, Thai Nguyen, Vietnam |
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| Abstract: | In this work, we pointed out that Sr substitution for Ca leads to modify the magnetic and magnetocaloric properties of Pr0.7Ca0.3-xSrxMnO3 compounds. Analyzing temperature dependence of magnetization, M(T), proves that the Curie temperature (TC) increased with increasing Sr content (x); TC value is found to be 130–260 K for x = 0.0–0.3, respectively. Using the phenomenological model and M(T,H) data measured at several applied magnetic field, the magnetocaloric effect of Pr0.7Ca0.3-xSrxMnO3 compounds has been investigated through their temperature and magnetic field dependences of magnetic entropy change ΔSm(T,H) and the change of the specific heat change ΔCP(T,H). Under an applied magnetic field change of 10 kOe, the maximum value of -ΔSm is found to be about 3 J/kg·K, and the maximum and minimum values of ΔCP(T) calculated to be about ±60 J/kg·K for x = 0.3 sample. Additionally, the critical behaviors of Pr0.7Ca0.3-xSrxMnO3 compounds around their TC have been also analyzed. Results suggested a coexistence of the ferromagnetic short- and long-range interactions in samples. Moreover, Sr-doping favors establishing the short-range interactions. |
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| Keywords: | Magnetocaloric effect Critical properties Phenomenological model Perovskite manganites |
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