科研之友
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摘要
A new sum rule has been derived for the atomic force constants from the invariance of the potential energy under the rigid body rotation of a crystal. For instance, it is found that there are actually two force constants in the nearest-neighbour approximation of a face-centred cubic (FCC) lattice, rather than three force constants, as usually supposed.
- 出版日期2007-9-26
- 单位重庆大学
