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3D-Ising-type magnetic interactions stabilized by the extremely large uniaxial magnetocrystalline anisotropy in layered ferromagnetic Cr2Te3
Materials Today Physics ( IF 10.0 ) Pub Date : 2024-07-30 , DOI: 10.1016/j.mtphys.2024.101522
Shubham Purwar , Tushar Kanti Bhowmik , Soumya Ghorai , Setti Thirupathaiah
Materials Today Physics ( IF 10.0 ) Pub Date : 2024-07-30 , DOI: 10.1016/j.mtphys.2024.101522
Shubham Purwar , Tushar Kanti Bhowmik , Soumya Ghorai , Setti Thirupathaiah
We investigate the magnetocrystalline anisotropy, critical behavior, and magnetocaloric effect in ferromagnetic-layered CrTe. We have studied the critical behavior around the Curie temperature () using various techniques, including the modified Arrott plot (MAP), the Kouvel-Fisher method (KF), and critical isothermal analysis (CI). The derived critical exponents = 0.353(4) and = 1.213(5) fall in between the three-dimensional (3D) Ising and 3D Heisenberg type models, suggesting complex magnetic interactions by not falling into any single universality class. On the other hand, the renormalization group theory, employing the experimentally obtained critical exponents, suggests 3D-Ising-type magnetic interactions decaying with distance as () = . We also observe an extremely large uniaxial magnetocrystalline anisotropy energy (MAE) of = 2065 kJ/m, the highest ever found in any CrTe based systems, originating from the noncollinear ferromagnetic ground state as predicted from the first-principles calculations. The self-consistent renormalization theory (SCR) suggests CrTe to be an out-of-plane itinerant ferromagnet. Further, a maximum entropy change of - 2.08 J/kg − is estimated around for the fields applied parallel to the -axis.
中文翻译:
层状铁磁 Cr2Te3 中极大的单轴磁晶各向异性稳定的 3D-Ising 型磁相互作用
我们研究了铁磁层状 CrTe 的磁晶各向异性、临界行为和磁热效应。我们使用各种技术研究了居里温度 () 附近的临界行为,包括修正的阿罗特图 (MAP)、Kouvel-Fisher 方法 (KF) 和临界等温分析 (CI)。导出的临界指数 = 0.353(4) 和 = 1.213(5) 落在三维 (3D) 伊辛模型和 3D 海森堡模型之间,表明不属于任何单一普遍性类别,从而表明复杂的磁相互作用。另一方面,重整化群理论采用实验获得的临界指数,表明 3D-Ising 型磁相互作用随距离衰减为 () = 。我们还观察到极大的单轴磁晶各向异性能量 (MAE) = 2065 kJ/m,这是所有基于 CrTe 的系统中发现的最高值,源自非共线铁磁基态,正如第一性原理计算所预测的那样。自洽重正化理论 (SCR) 表明 CrTe 是一种面外流动铁磁体。此外,对于平行于 - 轴施加的场,估计大约 - 2.08 J/kg - 的最大熵变化。
更新日期:2024-07-30
中文翻译:
层状铁磁 Cr2Te3 中极大的单轴磁晶各向异性稳定的 3D-Ising 型磁相互作用
我们研究了铁磁层状 CrTe 的磁晶各向异性、临界行为和磁热效应。我们使用各种技术研究了居里温度 () 附近的临界行为,包括修正的阿罗特图 (MAP)、Kouvel-Fisher 方法 (KF) 和临界等温分析 (CI)。导出的临界指数 = 0.353(4) 和 = 1.213(5) 落在三维 (3D) 伊辛模型和 3D 海森堡模型之间,表明不属于任何单一普遍性类别,从而表明复杂的磁相互作用。另一方面,重整化群理论采用实验获得的临界指数,表明 3D-Ising 型磁相互作用随距离衰减为 () = 。我们还观察到极大的单轴磁晶各向异性能量 (MAE) = 2065 kJ/m,这是所有基于 CrTe 的系统中发现的最高值,源自非共线铁磁基态,正如第一性原理计算所预测的那样。自洽重正化理论 (SCR) 表明 CrTe 是一种面外流动铁磁体。此外,对于平行于 - 轴施加的场,估计大约 - 2.08 J/kg - 的最大熵变化。