Fermi liquid description of La2−xSrxCuO4

✍ Scribed by G. Kotliar; P.A. Lee; N. Read

• Book ID: 103943221
• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 395 KB
• Volume: 153-155
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(88)90714-9

✦ Synopsis

We treat a model with orbitals on the copper and oxygen sites and hopping between them. In the limit of infinite U on the Cu site, the problem is treated using the slave boson method. In the presence of doping, we find a Fermi liquid solution with mass enhancement proportional to x -1. Low frequency optical absorption shows deviation from a simple Drude behavior, with oscillator strength proportional to x. Interactions between quasi-particles via the exchange of slave bosons is calculated. The Heisenberg exchange interaction J arises as a second order boson exchange and may give rise to singlet pairing between quasi-particles. Our treatment is essentially a perturbation theory valid when J is less than the renormalized bandwidth. Consequently the Fermi liquid description may break down for small doping.