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VOLUME 44 (1986) | ISSUE 2 | PAGE 87
Local configurational instability of the lattice near an impurity in a cubic crystal
A spontaneous local change in the lattice structure of a cubic crystal near an impurity in a narrow temperature interval has been observed for the first time. The effect is interpreted as the onset of an instability with respect to a quasilocal vibration of symmetry A2 associated with a manganese impurity in a BaF2 crystal.