Magnetism and giant magnetocaloric effect in rare-earth-based compounds R_3BWO_9(R = Gd,Dy, Ho) |
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| Affiliation: | 1.Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, China;2.Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, and Key Laboratory of Strongly-Coupled Quantum Matter Physics(CAS), University of Science and Technology of China, Hefei 230026, China;3.School of Physics & Material Science, Anhui University, Hefei 230039, China |
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| Abstract: | The magnetism and magnetocaloric effect (MCE) of rare-earth-based tungstate compounds $R_{3}$BWO$_{9 }$ ($R = {\rm Gd}$, Dy, Ho) have been studied by magnetic susceptibility, isothermal magnetization, and specific heat measurements. No obvious long-range magnetic ordering can be found down to 2 K. The Curie-Weiss fitting and magnetic susceptibilities under different applied fields reveal the existence of weak short-range antiferromagnetic couplings at low temperature in these systems. The calculations of isothermal magnetization exhibit a giant MCE with the maximum changes of magnetic entropy being 54.80 J/kg$\cdot$K at 2 K for Gd$_{3}$BWO$_{9}$, 28.5 J/kg$\cdot$K at 6 K for Dy$_{3}$BWO$_{9}$, and 29.76 J/kg$\cdot$K at 4 K for Ho$_{3}$BWO$_{9}$, respectively, under a field change of 0-7 T. Especially for Gd$_{3}$BWO$_{9}$, the maximum value of magnetic entropy change ($-\Delta S_{M}^{\max}$) and adiabatic temperature change ($ - \Delta T_{\rm ad}^{\max}$) are 36.75 J/kg$\cdot$K and 5.56 K for a low field change of 0-3 T, indicating a promising application for low temperature magnetic refrigeration. |
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| Keywords: | magnetocaloric effect short-range spin correlation |
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