Spin waves in antiferromagnetic FeF2
Spin waves in antiferromagnetic FeF2
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反铁磁 FeF2 中的自旋波
DOI：
10.1088/0022-3719/3/2/013
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发表时间：
1970
期刊：
影响因子：
--
通讯作者：
H. Guggenheim
中科院分区：
文献类型：
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作者：
M T Hutchings;B. Rainford;H. Guggenheim
用中子非弹性散射方法研究了反铁磁FeF_2的自旋波色散。观察到的单模具有相对平坦的色散曲线，从区域中心的53 cm-1上升到区域边界的79 cm-1。一个自旋哈密顿量，其中包括一个单离子各向异性常数D（Hsi=-DSiz 2），三个交换参数J1（Hex 12 =JlS1.S2）和偶极相互作用已被拟合到测量的能量。D=6.46（+0.29，-0.10）cm-1，J1（沿c轴沿着耦合相邻离子）=-0.048（+或-0.060）cm-1，j2（在单元的拐角和主体中心处耦合相邻离子）=+3.64（+或-0.10）cm-1，并且J3（沿沿着a轴耦合相邻离子）=+0.194（+0.060）cm-1。
Spin-wave dispersion in antiferromagnetic FeF2 has been investigated by inelastic neutron scattering using a chopper time-of-flight spectrometer. The single mode observed has a relatively flat dispersion curve rising from 53 cm-1 at the zone centre to 79 cm-1 at the zone boundary. A spin Hamiltonian which includes a single-ion anisotropy constant D (Hsi=-DSiz2), three exchange parameters Jl(Hex12=JlS1.S2) and dipolar interactions has been fitted to the measured energies. The authors find D=6.46 (+0.29, -0.10) cm-1, J1 (coupling neighbouring ions along the c axis)=-0.048 (+or-0.060) cm-1, j2 (coupling neighbouring ions at the corner and body centre of the cell)=+3.64(+or-0.10) cm-1, and J3 (coupling neighbouring ions along the a axis)=+0.194 (+0.060) cm-1.