Field-induced canting of magnetic moments in GdCo5 at finite temperature: first-principles calculations and high-field measurements.
Field-induced canting of magnetic moments in GdCo5 at finite temperature: first-principles calculations and high-field measurements.
复制标题
有限温度下 GdCo5 中磁场引起的磁矩倾斜：第一原理计算和高场测量。
DOI：
10.1088/1361-648x/aad029
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Patrick CE
中科院分区：
文献类型：
--
作者：
Patrick CE
本文对GdCo 5单晶在60 T量级磁场中的磁化强度随温度的变化进行了计算和实验测量。在零温下，基于密度泛函理论的无序局域矩图的计算预测了在46.1T下Gd和Co矩从反铁磁到倾斜排列的场诱导转变。在较高的温度下，计算发现该临界场随着零场磁化沿着增加。实验测量观察到这种转变发生在1.4K下的44-48 T之间。高达至少100 K的温度下，实验继续观察到的过渡，然而，在与计算的差异，没有强烈的温度依赖性的临界场是明显的。我们将这种差异归因于在低温下计算的零场磁化强度的不准确描述，这是由于使用了经典统计力学。校正这种影响，我们恢复了一致的描述GdCo 5的高场磁化强度的理论和实验。
We present calculations and experimental measurements of the temperature-dependent magnetization of a single crystal of GdCo 5 in magnetic fields of order 60 T. At zero temperature the calculations, based on density-functional theory in the disordered-local-moment picture, predict a field-induced transition from an antiferromagnetic to a canted alignment of Gd and Co moments at 46.1 T. At higher temperatures the calculations find this critical field to increase along with the zero-field magnetization. The experimental measurements observe this transition to occur between 44–48 T at 1.4 K. Up to temperatures of at least 100 K, the experiments continue to observe the transition; however, at variance with the calculations, no strong temperature dependence of the critical field is apparent. We assign this difference to the inaccurate description of the zero-field magnetization of the calculations at low temperatures, due to the use of classical statistical mechanics. Correcting for this effect, we recover a consistent description of the high-field magnetization of GdCo 5 from theory and experiment.