Senff D, Krüger F, Scheidl S, Benomar M, Sidis Y, Demmel F, Braden M
II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany.
Phys Rev Lett. 2006 Jun 30;96(25):257201. doi: 10.1103/PhysRevLett.96.257201. Epub 2006 Jun 26.
The magnon dispersion in the charge, orbital, and spin ordered phase in La1/2Sr3/2MnO4 has been studied by means of inelastic neutron scattering. We find excellent agreement with a magnetic interaction model based on the CE-type superstructure. The magnetic excitations are dominated by ferromagnetic exchange parameters revealing a nearly one-dimensional character at high energies. The strong ferromagnetic interaction in the charge or orbital ordered phase appears to be essential for the capability of manganites to switch between metallic and insulating phases.
通过非弹性中子散射研究了La1/2Sr3/2MnO4中电荷、轨道和自旋有序相中的磁振子色散。我们发现与基于CE型超结构的磁相互作用模型非常吻合。磁激发由铁磁交换参数主导，在高能下呈现出近一维特征。电荷或轨道有序相中的强铁磁相互作用似乎是锰氧化物在金属相和绝缘相之间切换能力的关键。
