Abstract
The structural, magnetic, and magnetocaloric properties of Ho1−xCaxMnO3 (x = 0, 0.1, 0.2, and 0.3) manganites were investigated in depth in this work. The samples were made by using standard solid-state reaction. The calcium-doped samples are formed in orthorhombic crystal structure with Pnma space group, while undoped sample shows hexagonal crystal structure with P63cm space group according to room temperature XRD measurements and Rietveld refinement by using the TOPAS software. The field emission scanning electron microscopy (FESEM) was used to examine the microstructure, and an energy-dispersive X-ray diffractometer (EDX) was used to estimate chemical compositions. At the Curie temperature, all the samples show a second-order magnetic phase transition. It has been discovered that when the amount of calcium doping increases, the Curie temperature increases. The effective magnetic moments (μeff) of HoMnO3, Ho0.9Ca0.1MnO3, Ho0.8Ca0.2MnO3, and Ho0.7Ca0.3MnO3 are 10.71, 10.93, 11.17, and 11.54 μB, respectively, which are equivalent to the theoretical value of 11.45 μB. The magnetic entropy change (− ΔSM) was calculated by using isothermal magnetization versus applied magnetic field. The calculated − ΔSM = 8.9 Jkg−1 K−1 value for undoped HoMnO3 sample at 17.7 K, while with an increase in calcium doping, the − ΔSM value have been drop down from 3.3 to 2.2 Jkg−1 K−1 about 35 K temperature.
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Acknowledgements
This study was supported by the Science Research Program through the National Research Foundation in Republic of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF contract No. 2020R1I1A3070554). S. Park and Y. Jo acknowledge the support by the KBSI grant (D110200) and Y. Jo also would like to acknowledge KBSI Grant (No. C140210).
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Shinde, K.P., Lee, E.J., Manawan, M. et al. Study of structural, magnetic, and magnetocaloric properties of Ho1−xCaxMnO3. Appl. Phys. A 127, 842 (2021). https://doi.org/10.1007/s00339-021-04991-y
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DOI: https://doi.org/10.1007/s00339-021-04991-y