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VOLUME 55 (1992) | ISSUE 11 | PAGE 635
Role of hybridization in the polaron mechanism for the formation of U- centers, soft potentials, and two-well potentials
A new version of the polaron mechanism for the formation of U ~~ centers is discussed. This version is valid in the case of a pronounced hybridization of a localized state with band states. With hybridization, the electron-phonon coupling describes both the appearance of U ~~ centers and the formation of soft and two-well potentials