Photoinduced Self-Localized Structural Distortions in YBa2Cu3O7-delta: Direct Evidence of Polarons or Bipolarons

Autor:	S. Cox, C. F. Foster, G. Stucky, A. J. Heeger, Y.H. Kim
Rok vydání:	1988
Předmět:	Tetragonal crystal system Materials science Condensed matter physics Atomic electron transition Infrared Phonon Infrared spectroscopy Charge carrier Polaron Molecular electronic transition
DOI:	10.21236/ada196091
Popis:	Photoinduced infrared absorption measurements of YBa2Cu307-delta (delta=0.75) in the spectral region from 150/cm to 4000 cm are reported. We observed photoinduced infrared active vibrations (IRAV) modes, associated phonon bleachings, and an electronic transition (from a localized gap state) peaked at 1050/cm (0.13 eV). The spectral features indicate a local tetragonal to orthorhombic distortion in the Cu-O plane around the photoinduced charge carriers in YBa2Cu307-delta is smaller than La2CuO4. The photoinduced structural distortion and the associated self-localized gap state demonstrate that the photoexcitations are relatively long lived polarons or bipolarons.
Databáze:	OpenAIRE
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