Anderson localization and breakdown of hydrodynamics in random ferromagnets.
Anderson localization and breakdown of hydrodynamics in random ferromagnets.
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随机铁磁体中的安德森定位和流体动力学分解。
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
Coppersmith
中科院分区：
文献类型：
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作者：
Bruinsma;Coppersmith
计算了具有弱随机性的海森堡磁体的动态结构因子。在详细解释的情况下，我们发现由于自旋波的局域化，流体动力学理论在纵向结构因素中失效。局域化导致了对Q的幂规律依赖，并确保了磁布拉格点附近的中子散射线形状的数学{omega}。描述幂定律的指数与安德森局域化的关联长度指数有关。随机各向异性磁体似乎是实验研究中很有前途的候选材料。
The dynamic structure factor of Heisenberg magnets with weak randomness is computed. Under circumstances which are explained in detail, we find failure of hydrodynamic theory in the longitudinal structure factor due to localization of spin waves. Localization induces a power-law dependence on q and ensuremath{omega} for the neutron scattering line shape near magnetic Bragg spots. The exponent describing the power law is related to the correlation-length exponent of Anderson localization. Random anisotropy magnets appear to be promising candidates for experimental investigations.