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arXiv · 1805.08203

Anisotropic magnetocaloric effect in single crystals of CrI$_3$

Yu Liu·C. Petrovic
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Abstract

We report a systematic investigation of dc magnetization and ac susceptibility, as well as anisotropic magnetocaloric effect in bulk CrI$_3$ single crystals. A second-stage magnetic transition was observed just below the Curie temperature $T_c$, indicating a two-step magnetic ordering. The low temperature thermal demagnetization could be well fitted by the spin-wave model rather than the single-particle model, confirming its localized magnetism. The maximum magnetic entropy change $-ΔS_M^{max} \sim 5.65$ J kg$^{-1}$ K$^{-1}$ and the corresponding adiabatic temperature change $ΔT_{ad} \sim 2.34$ K are achieved from heat capacity analysis with the magnetic field up to 9 T. Anisotropy of $ΔS_M(T,H)$ was further investigated by isothermal magnetization, showing that the difference of $-ΔS_M^{max}$ between the $ab$ plane and the $c$ axis reaches a maximum value $\sim$ 1.56 J kg$^{-1}$ K$^{-1}$ with the field change of 5 T. With the scaling analysis of $ΔS_M$, the rescaled $ΔS_M(T,H)$ curves collapse onto a universal curve, indicating a second-order type of the magnetic transition. Furthermore, the $-ΔS_M^{max}$ follows the power law of $H^n$ with $n = 0.64(1)$, and the relative cooling power RCP depends on $H^m$ with $m = 1.12(1)$.

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Yu Liu, C. Petrovic. 2018-05-21. Anisotropic magnetocaloric effect in single crystals of CrI$_3$. https://doi.org/10.1103/physrevb.97.174418

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