Phonon squeezed state in high-Tc superconductors

✍ Scribed by Takayuki Sota; Katsuo Suzuki

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 315 KB
• Volume: 165-166
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/s0921-4526(09)80127-0

✦ Synopsis

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 a condition that the squeezed state occurs. It follows that the squeezed state can exist when the interband electron transfer is allowed in many-band system.