Abstract
A new sum rule has been derived for the atomic force constants from the invariance of thepotential energy under the rigid body rotation of a crystal. For instance, it is found thatthere are actually two force constants in the nearest-neighbour approximation of aface-centred cubic (FCC) lattice, rather than three force constants, as usuallysupposed.
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Schedule a callMore From: Journal of physics. Condensed matter : an Institute of Physics journal
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