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arXiv 1608.05653cond-mat.mtrl-sci
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磁性绝缘体中电子自旋共振线宽的温度依赖性

Temperature dependence of the electron spin resonance linewidth in magnetic insulators

M. Acikgoz, D. L. Huber

摘要:

我们分析了交换耦合磁性绝缘体中临界区以上的电子自旋共振线宽随温度的变化关系。重点是在自旋-自旋项为常数,单声子项和双声子项分别随T和T^2变化的温度下,将自旋-自旋相互作用、自旋-单声子相互作用和自旋-双声子相互作用对线宽的贡献分开。以Co_3O_4为例,我们在50 K < T < 500 K的温度范围内使用最小二乘拟合来获得三个组分的值。发现在100 K以下,自旋-自旋机制占主导地位,而在250 K以上,双声子机制最为重要。在中间区域,所有三个机制都作出了重大贡献。

英文摘要:

We analyze the temperature dependence of the electron spin resonance linewidth above the critical region in exchange-coupled magnetic insulators. The focus is on separating the contributions to the linewidth from spin-spin interactions, spin-one-phonon interactions and spin-two-phonon interactions at temperatures where the spin-spin term is constant and the one- and two-phonon terms vary as T and T^2, respectively. Taking Co3O4 as an example, we use a least squares fit over the temperature range 50 K < T < 500 K to obtain values of the three components. It is found that the spin-spin mechanism is dominant below 100 K, while the two-phonon mechanism is most important above 250 K. In the intermediate region, all three mechanisms make significant contributions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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