Theory of Spin Resonance in Dilute Magnetic Alloys
Theory of Spin Resonance in Dilute Magnetic Alloys
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稀磁合金中的自旋共振理论
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
J. Wilkins
中科院分区：
文献类型：
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作者：
D. Langreth;J. Wilkins
Kadanoff和Baym的方案被证明是有用的严格推导的自旋系统的布洛赫或玻尔兹曼方程。该计划被施加到一个系统的传导电子在金属相互作用通过交换相互作用$J$与低密度的本地自旋。耦合布洛赫方程适用于传导电子自旋共振严格推导出二阶在$J$。导出的方程的突出特点是：（i）扰动磁化强度弛豫到瞬时局部平衡磁化强度，从而获得正确的静态磁化率;（ii）瞬时磁化强度与引起磁化强度进动的有效磁场不成比例;（iii）方程与总磁化强度守恒相一致。
The scheme of Kadanoff and Baym is shown to be useful for the rigorous derivation of Bloch or Boltzmann equations for spin systems. The scheme is applied to a system of conduction electrons in a metal interacting via an exchange interaction $J$ with a low density of local spins. The coupled Bloch equations appropriate to conduction-electron spin resonance are derived rigorously to second order in $J$. The prominent features of the derived equations are that (i) the disturbed magnetizations are shown to relax to the instantaneous local equilibrium magnetization with the result that correct static susceptibilities are obtained, (ii) the instantaneous magnetizations are not proportional to the effective magnetic fields causing the magnetizations to precess, and (iii) the equations are consistent with conservation of the total magnetization.