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首页> 外文期刊>Physical review >Noncollinear spin-fluctuation theory of transition-metal magnetism: Role of transverse spin fluctuations in Fe
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Noncollinear spin-fluctuation theory of transition-metal magnetism: Role of transverse spin fluctuations in Fe

机译：过渡金属磁性的非共线自旋涨落理论：铁中横向自旋涨落的作用

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摘要

A local electronic theory of transition-metal magnetism at finite temperatures is presented, which takes into account longitudinal and transverse spin fluctuations on the same footing. The magnetic properties are determined in the framework of a rotational-invariant d-band model Hamiltonian by applying a four-field Hubbard-Stratonovich functional-integral method in the static approximation. The role of transverse spin excitations on the temperature-dependent magnetic properties is investigated by performing alloy averages in the single-site virtual crystal approximation. Bulk Fe is considered as the representative example for the applications. Results are given for the average magnetization M, for the spin-excitation energies, and for the transverse and longitudinal contributions to the local magnetic moments μ_l at atom l. The importance of noncollinear spin excitations is quantified by comparison with the corresponding collinear calculations. An important reduction of about 33% of the calculated Curie temperature T_c is obtained, which now amounts to 1250 K and is thus relatively close to the experimental value. The longitudinal (transverse) components of μ_l are found to decrease (increase) as a function of temperature until the full rotational symmetry is reached at T_c. This reflects the increasing importance of the transverse spin fluctuations. The origin of the temperature dependence of M and μ_l is analyzed in terms of the local spin-fluctuation energies.
机译：提出了一种在有限温度下过渡金属磁性的局部电子理论，该理论考虑了在同一基础上的纵向和横向自旋波动。通过在静态近似中应用四场Hubbard-Stratonovich功能积分方法，在旋转不变d波段模型哈密顿量的框架中确定磁性能。通过在单点虚拟晶体近似中执行合金平均值，研究了横向自旋激发对温度相关磁性能的作用。散装铁被认为是该应用的代表性实例。给出了平均磁化强度M，自旋激发能以及对原子l上局部磁矩μ_1的横向和纵向贡献的结果。通过与相应的共线计算进行比较，可以量化非共线自旋激励的重要性。获得了计算的居里温度T_c的大约33％的重要降低值，现在降低到1250 K，因此相对接近实验值。发现μ_1的纵向（横向）分量根据温度而减小（增加），直到在T_c达到完全旋转对称为止。这反映了横向自旋波动的重要性日益增加。根据局部自旋涨落能来分析M和μ_1的温度依赖性的起源。

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