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Electronic Structure and Magnetocaloric Effect of Sr-Doped SmCoO3 Perovskites

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Abstract

We present a study on the magnetic and magnetocaloric characters of Sm1-xSrxCoO3 (x = 0.4–0.6) synthesized by solid-state reactions. Recorded M(T) data at H = 100 Oe show an increase of the Curie temperature (TC) from 143 K for x = 0.4 to 153 K for x = 0.5, but a higher x value (x = 0.6) reduces TC to ~ 92 K. A singularity region sandwiched between the Griffiths and pure paramagnetic phases has been observed in x = 0.4, but it becomes invisible at x = 0.5 and 0.6. These properties are assigned to a competition between ferromagnetic and anti-ferromagnetic interactions induced by Co3+ and Co4+ ions. The Co3+/Co4+ mixed valence has been confirmed upon the analysis of Co K-edge x-ray absorption spectra. Using Maxwell’s relations and M(H) data, we have calculated the absolute magnetic entropy change (|∆Sm|). Around TC, the maximum magnetic entropy changes (|∆Smax|) of x = 0.4, 0.5 and 0.6 are about 1.19, 1.22 and 0.81 J/kg K for H = 50 kOe, respectively. The values of the relative cooling power are in the range of 58 ~ 93 J/kg. Our analyses also indicate all |∆Sm (T, H)| data obeying the universal master curve as constructing the |∆Sm|/|∆Smax| vs. θ plots, where θ is defined as the reduced temperature. When considering exponential parameters N(T, H) and n associated with |∆Sm(T, H)| and |∆Smax(H)|, respectively, we have found their values are different from the mean-field theory value n = 2/3. These results prove the Sm1-xSrxCoO3 samples have the second-order nature and short-range magnetic order.

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Acknowledgments

The research was supported by the National Research Foundation of Korea Grant No. 2020R1A2C1008115. The work was also supported by the National Research Foundation of Korea (NRF) grants funded by the Korean government’s Ministry of Science and ICT (MSIT, 2020R1A2B5B01002184). In Vietnam, the work was supported by the Vietnam Ministry of Education and Training grant No. B2022-SPK-07.

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Authors and Affiliations

  1. Phenikaa University Nano Institute (PHENA), PHENIKAA University, Hanoi, 12116, Vietnam

    T. V. Manh

  2. Department of Physics, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea

    T. V. Manh, H. R. Park & S. C. Yu

  3. Academic Affairs Department, Vietnam National University, Hoa Lac, Thach That, Hanoi, Vietnam

    Y. Pham

  4. Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, Yongin, 17035, South Korea

    T. L. Phan & B. W. Lee

  5. Institute of Research and Development, Duy Tan University, Danang, 550000, Vietnam

    N. T. Dang & N. Tran

  6. Faculty of Environmental and Natural Sciences, Duy Tan University, Danang, 550000, Vietnam

    N. T. Dang & N. Tran

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TVM, YP, NTD, and TLP: Conceptualization, Methodology and Writing; NT, HRP: Investigation; BWL, SCY: Reviewing and Editing.

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Manh, T.V., Pham, Y., Phan, T.L. et al. Electronic Structure and Magnetocaloric Effect of Sr-Doped SmCoO3 Perovskites. J. Electron. Mater. 52, 177–187 (2023). https://doi.org/10.1007/s11664-022-09943-7

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