The DX centre
T.N. Morgan
Semiconductor Science and Technology
From Raman measurements on superconducting and non-superconducting YBa2Cu3O7-δ single crystals, we show that close to room temperature there is an unaccounted for, intense, oxygen vibrational mode at 598 cm-1. This (zz) polarized mode appears to arise from some chain oxygen atoms occupying another site in the crystal. Using laser heating and a shutter, we find that the time it takes to occupy or empty this site is less than 0.1 sec. If a charge carrier in the Cu-O plane induces the occupation of this new site, then a large electron-phonon coupling constant could result. © 1990.
T.N. Morgan
Semiconductor Science and Technology
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INFORMS 2021
Xikun Hu, Wenlin Liu, et al.
IEEE J-STARS
A. Krol, C.J. Sher, et al.
Surface Science