Phonon crystal-field excitations in high-Tc superconductors
β Scribed by T. Ruf
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 272 KB
- Volume
- 219-220
- Category
- Article
- ISSN
- 0921-4526
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## Abstract For Abstract see ChemInform Abstract in Full Text.
We study the phonon states in high T c superconducting materials within a weakcoupling polaron model. It is confirmed that the squeezed state of phonons gives lower ground state energy of the whole system than the two-phonon coherent state and the displaced state proposed previously. We also examine
By using large single crystals of YBa2Cu3Or, precise temperature and doping dependence of the c-axis infrared active phonons are investigated. The effect of the superconducting gap opening on the phonon self-energy is observed for the optimally doped crystal but not for the overdoped crystal, which