| Fe3Si在低温下的自旋波研究 |
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| 引用本文： | 陶昉,严启伟,沈志工,P. v. BLANCKENHAGEN,林虹,林泉.Fe3Si在低温下的自旋波研究[J].物理学报,1987,36(5):570-576. |
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| 作者姓名： | 陶昉 严启伟 沈志工 P. v. BLANCKENHAGEN 林虹 林泉 |
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| 作者单位： | (1)Kernforschungszentrum Karlsruhe,FRG; (2)中国科学院物理研究所; (3)中国原子能科学研究院 |
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| 摘 要： | 用中子相干非弹性散射测量了Fe3Si在14K的自旋波色散关系。从自旋波二次方色散关系得到低温下自旋波劲度系数D0=270meV·?2。用Heisenberg模型可进一步导出Fe3Si的有效交换积分Jeff。从磁化强度的温度依赖关系也获得了一个自旋波劲度系数Dm(O)。从两种不同方法获得的劲度系数的比较中发现在Fe3Si中可能存在着Stoner激发,与早先工作相联系,本文还给出了从14K直到居里温度自旋波劲度系数D的温度依赖关系。
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| 收稿时间： | 1986-06-25 |
A STUDY OF SPIN WAVE IN Fe3Si AT LOW TEMPERATURE |
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| TAO FANG,YAN QI-WEI,SHEN ZHI-GONG,P. v. BLANCKENHAGEN,LIN HONG and LIN QUAN.A STUDY OF SPIN WAVE IN Fe3Si AT LOW TEMPERATURE[J].Acta Physica Sinica,1987,36(5):570-576. |
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| Authors: | TAO FANG YAN QI-WEI SHEN ZHI-GONG P v BLANCKENHAGEN LIN HONG and LIN QUAN |
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| Abstract: | The dispersion relation of spin wave in Fe3Si at 14 K has been measured by inelastic coherent neutron scattering. The spin wave stiffness constant D0, which is obtained experimentally from quadratic dispersion of spin wave, equals 270 meV ?2. A calculation of effective exchange integral Jeff has been done in the frame of Heisenberg model. From the temperature dependence of magnetization, a spin wave stiffness constant Dm(0) can be derived also. There is an indication of the existence of Stoner excitations from a comparison of D0 and Dm(0). The temperature dependence of spin wave stiffness constant is also gaven.
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