论文标题
与偶极相互作用的铁磁体中自洽的谐波近似的有效性
Effectiveness of the Self-Consistent Harmonic Approximation in ferromagnets with dipolar interactions
论文作者
论文摘要
在处理磁模型的各种方法中，在许多不同的情况下，自洽的谐波近似（SCHA）成功地描述了铁罗和抗铁磁性。特别是，SCHA是确定过渡温度的有价值且容易的形式主义，例如Berezinskii-Kosterlitz-毫无疑问。该方法的核心包括根据温度的重新归一化参数的热波动。然而，大多数工作都是仅考虑短距离相互作用而完成的，这导致对实际磁性样品的不完整描述。在这里，我们将SCHA推广到热力学分析中包括偶极相互作用。该方法用于分析众所周知的Europium chalcogenides EUO和EUS。 SCHA结果与实验测量非常吻合。
Among the various methods for treating magnetic models, the Self-Consistent Harmonic Approximation (SCHA) has successfully described ferro and antiferromagnetism in many different scenarios. In particular, the SCHA is a valuable and easy formalism for determining transition temperatures as, for example, the Berezinskii-Kosterlitz-Thouless. The heart of the method includes thermal fluctuations through of a renormalization parameter depending on temperature. Nevertheless, most of the work has been done considering only short-range interactions, which results in an incomplete description of actual magnetic samples. Here, we generalize the SCHA to include the dipolar interaction in the thermodynamic analysis. The method is applied to analyze the well-known Europium Chalcogenides EuO and EuS. The SCHA results are in good agreement with the experimental measurements.
