Hole pairing in antiferromagnetically correlated layered oxides

✍ Scribed by Narendra Kumar

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 158 KB
• Volume: 153-155
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(88)90254-7

✦ Synopsis

We have considered a two-band Hubbard model having interlaced Cu-Sd(x 2 _y2) and O-2p(x,y) orbitals representing the Cue 2 square planes.

Simple CuQ~-cluster calculation suggests that the additional holes created by doping stay mainly on oxygen. Motibn of an oxygen hole interlacing with the antiferromagnetically correlated background of copper spins, creates a string of high energy spin configuration of finite length giving mass renormalization. Another hole of opposite spin can now anneal this string tension providing a traingular pairing potential for large pair momentum.

The latter implies unusual Bose condensation of the wake-bound compact Bose-like pairs on a non-zero momentum shell. Effect of disorder favouring condensation at the ,-nobility edge is pointed out.