Hole pairing in antiferromagnetically correlated layered oxides

Kumar, Narendra (1988) Hole pairing in antiferromagnetically correlated layered oxides Physica C: Superconductivity, 153-155 . pp. 1227-1228. ISSN 0921-4534

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0921-4534(88)90254-7


We have considered a two-band Hubbard model having interlaced Cu-3d(x2-y2) and O-2p(x, y) orbitals representing the CuO2 square planes. Simple CuO2-cluster calculation suggests that the additional holes created by doping stay mainly on oxygen. Motion 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 triangular 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 mobility edge is pointed out.

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