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arXiv 2007.08624cond-mat.str-el
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CrSbSe $_3$的各向异性磁热效应和临界行为

Anisotropic magnetocaloric effect and critical behavior in CrSbSe$_3$

Yu Liu, Zhixiang Hu, C. Petrovic

摘要:

报道了准一维铁磁CrSbSe $_3$单晶的各向异性磁热效应和临界行为。最大磁熵变$-ΔS_M^{max}$为2.16 J kg $^{-1}$ K $^{-1}$(对于易$a$轴)(对于硬$b$轴为2.03 J kg $^{-1}$ K $^{-1}$),并且在磁场变化为50 kOe的情况下,在$T_c$附近对于易$a$轴的相对冷却功率$RCP$为163.1 J kg $^{-1}$(对于硬$b$轴为142.1 J kg $^{-1}$)。磁晶各向异性常数$K_u$在10 K时为148.5 kJ m $^{-3}$,在70 K时降至39.4 kJ m $^{-3}$。沿所有三个轴的重新标度的$ΔS_M(T,H)$曲线分别塌陷到通用曲线上,证实了二级铁磁转变。进一步的$T_c \sim$ 70 K附近的临界行为分析表明,对于$H\parallel a$,临界指数$β$ = 0.26(1)、$γ$ = 1.32(2)和$δ$ = 6.17(9),而对于$H\parallel b$,临界指数$β$ = 0.28(2)、$γ$ = 1.02(1)和$δ$ = 4.14(16)。所确定的临界指数表明,在CrSbSe $_3$的各向异性磁耦合是强烈依赖于所施加的磁场的取向。

英文摘要:

We report anisotropic magnetocaloric effect and critical behavior in quasi-one-dimensional ferromagnetic CrSbSe$_3$ single crystal. The maximum magnetic entropy change $-ΔS_M^{max}$ is 2.16 J kg$^{-1}$ K$^{-1}$ for easy $a$ axis (2.03 J kg$^{-1}$ K$^{-1}$ for hard $b$ axis) and the relative cooling power $RCP$ is 163.1 J kg$^{-1}$ for easy $a$ axis (142.1 J kg$^{-1}$ for hard $b$ axis) near $T_c$ with a magnetic field change of 50 kOe. The magnetocrystalline anisotropy constant $K_u$ is estimated to be 148.5 kJ m$^{-3}$ at 10 K, decreasing to 39.4 kJ m$^{-3}$ at 70 K. The rescaled $ΔS_M(T,H)$ curves along all three axes collapse onto a universal curve, respectively, confirming the second order ferromagnetic transition. Further critical behavior analysis around $T_c \sim$ 70 K gives that the critical exponents $β$ = 0.26(1), $γ$ = 1.32(2), and $δ$ = 6.17(9) for $H\parallel a$, while $β$ = 0.28(2), $γ$ = 1.02(1), and $δ$ = 4.14(16) for $H\parallel b$. The determined critical exponents suggest that the anisotropic magnetic coupling in CrSbSe$_3$ is strongly dependent on orientations of the applied magnetic field.

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