Inelastic neutron scattering measurements on Nd2Fe14B single crystals
Inelastic neutron scattering measurements on Nd2Fe14B single crystals
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Nd2Fe14B 单晶的非弹性中子散射测量
DOI：
10.1016/0304-8853(91)90183-b
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
W. Rodewald
中科院分区：
文献类型：
--
作者：
H. Mayer;M. Steiner;N. Stüβer;H. Weinfurter;K. Kakurai;B. Dorner;P. Lindgård;K. Clausen;S. Hock;W. Rodewald
对Nd2Fe14B单晶进行了非弹性中子散射测量。沿高对称性方向[0，0，1]发现了一条强烈依赖于温度的磁振子色散曲线，在(0，0，2)处有一个间隙。在自旋重取向温度附近观察到自旋波矢qc=0时的软模行为。当qc较大时，非弹性散射强度急剧下降。因此，色散曲线只能测量到布里渊区的中间。在经典自旋波模型的框架下讨论了色散。除了磁振子外，我们还发现了两个声学声子模，它们的能量与先前在Nd2Fe14B多晶样品中测得的声速很好地一致。
Inelastic neutron scattering measurements have been carried out on a Nd2Fe14B single crystal. A strongly temperature-dependent magnon dispersion curve has been found along the high-symmetry direction [0, 0, 1] with a gap at (0, 0, 2). Soft mode behaviour at spin wave vectorqc= 0 was observed near the spin reorientation temperature. The inelastic scattering intensity decreases steeply for largerqc. Therefore the dispersion curve could be measured until the middle of the Brillouin zone only. The dispersion is discussed in the frame of a classical spin wave model. In addition to the magnons we could identify two acoustic phonon modes whose energies are in good agreement with the sound velocity as previously determined in a polycrystalline sample of Nd2Fe14B.