论文标题
磁晶的各向异性和磁源效应研究对房间温度2D铁磁CR $ _4 $ _4 $ _5 $ _5 $
Magnetocrystalline Anisotropy and Magnetocaloric Effect Studies on the Room-temperature 2D Ferromagnetic Cr$_4$Te$_5$
论文作者
论文摘要
我们介绍了一项关于磁敏性特性和磁静电效应的详尽研究，该层次的铁磁Cr $ _4 $ _4 $ _5 $ _5 $单晶通过对磁化等温度的关键行为进行分析。关键指数$β$ = 0.485（3），$γ$ = 1.202（5）和$δ$ = 3.52（3），居里温度为$ t_c \约340.73（4）$ k由修改后的弧度确定。我们观察到一个大型磁晶的各向异性k $ _U $ = 330 kJ/$ m^3 $ 3 k，随着温度的升高逐渐降低。最大熵更改 - $δS_{M}^{Max} $和相对冷却功率（RCP）分别为2.77 $ J/kg-k $和88.29 $ j/kg $，当磁场与$ \ it $ \ it $ \ it {ab} $ - 平面平行时。重新定制-UΔS_M（T，H）$数据在各种温度和场上测量的数据崩溃成单个通用曲线，从而证实了该系统中的二阶磁过渡。遵循重新归一化的小组理论分析，我们发现自旋耦合为3D Heisenberg-type，$ \ {d：n \} = \ {3：3：3 \} $，远距离交流交互作用为$ j（r）= r^{ - （d+σ）= r^r^r^r^{ - 4.71}。
We present a thorough study on the magnetoanisotropic properties and magnetocaloric effect in the layered ferromagnetic Cr$_4$Te$_5$ single crystals by performing the critical behaviour analysis of magnetization isotherms. The critical exponents $β$=0.485(3), $γ$=1.202(5), and $δ$=3.52(3) with a Curie temperature of $T_C \approx 340.73(4)$ K are determined by the modified Arrott plots. We observe a large magnetocrystalline anisotropy K$_u$=330 kJ/$m^3$ at 3 K which gradually decreases with increasing temperature. Maximum entropy change -$ΔS_{M}^{max}$ and the relative cooling power (RCP) are found to be 2.77 $J/kg-K$ and 88.29 $J/kg$, respectively near $T_C$ when the magnetic field applied parallel to $\it{ab}$-plane. Rescaled -$ΔS_M (T, H)$ data measured at various temperatures and fields collapse into a single universal curve, confirming the second order magnetic transition in this system. Following the renormalization group theory analysis, we find that the spin-coupling is of 3D Heisenberg-type, $\{d:n\}=\{3:3\}$, with long-range exchange interactions decaying as $J (r) = r^{-(d+σ)}= r^{-4.71}$.
