| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Magnetocaloric properties and Griffiths phase of ferrimagnetic cobaltite CaBaCo4O7 |
| Tina Raoufi1,2, Jincheng He(何金城)1,2, Binbin Wang(王彬彬)1,2, Enke Liu(刘恩克)1,2, and Young Sun(孙阳)1,3,† |
1 Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
3 Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China |
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Abstract We present a study on the magnetocaloric properties of a CaBaCo$_{4}$O$_{7}$ polycrystalline cobaltite along with research on the nature of magnetic phase transition. The magnetization as a function of temperature identifies the ferrimagnetic to paramagnetic transition at a Curie temperature of 60 K. Moreover, a Griffiths-like phase is confirmed in a temperature range above $T_{\rm C}$. The compound undergoes a crossover from the first to second-order ferrimagnetic transformation, as evidenced by the Arrott plots, scaling of the universal entropy curve, and field-dependent magnetic entropy change. The maximum of entropy change is 3 J/kg$\cdot$K for $\Delta H = 7$ T at ${T}_{\rm C}$, and a broadening of the entropy peak with increasing magnetic field indicates a field-induced transition above $T_{\rm C}$. The analysis of the magnetic entropy change using the Landau theory reveals the second-order phase transition and indicates that the magnetocaloric properties of CaBaCo$_{4}$O$_{7}$ are dominated by the magnetoelastic coupling and electron interaction. The corresponding values of refrigerant capacity and relative cooling power are estimated to be 33 J/kg and 42 J/kg, respectively.
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Received: 25 July 2022
Revised: 29 August 2022
Accepted manuscript online: 05 September 2022
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PACS:
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75.40.Cx
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(Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.))
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75.50.-y
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(Studies of specific magnetic materials)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51725104) and Beijing Natural Science Foundation (Grant No. Z180009). |
Corresponding Authors:
Young Sun
E-mail: youngsun@cqu.edu.cn
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Cite this article:
Tina Raoufi, Jincheng He(何金城), Binbin Wang(王彬彬), Enke Liu(刘恩克), and Young Sun(孙阳) Magnetocaloric properties and Griffiths phase of ferrimagnetic cobaltite CaBaCo4O7 2023 Chin. Phys. B 32 017504
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