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VOLUME 67 (1998) | ISSUE 6 | PAGE 399
Model of isostructural dynamical phase transition in anharmonic crystal with possible relevance to SrTi3
PACS: 05.70.Fh; 63.75.+z
We discuss a new type of phase transitions that correspond to a pairing of phonons of different lattice modes due to their anharmonic attraction in a crystal. We show that the main features of the isostructural phase transition observed in SrTiOs at Τ ~ 37 К can be qualitatively explained with the phonon pairing phenomenon.