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- Title
d-Symmetry superconductivity as a consequence of valence-bond type correlations.
- Authors
Ovchinnikov, A. A.; Ovchinnikova, M. Ya.; Plekhanov, E. A.
- Abstract
It is shown that d[sub x[sup 2]-y[sup 2]] symmetry of superconducting order due to valence bond (VB) type correlations is possible. The VB correlations are compatible with antiferromagnetic (AF) spin order. For the two-dimensional Hubbard model with arbitrary doping, the variational method of local unitary transformations is used to construct explicitly a uniform state with VB structure. The d-channel attraction of holes is a consequence of the modulation of hops by the populations of centers accompanying VB formation, and the parameters of the modulation are determined variationally. The increase in the density of states at the Fermi level accompanying AF splitting of the band, which is absent in the paramagnetic state, is important for the gap width. The gap width and its ratio to T[sub c] are of the order of 2Δ=0.1t and 2Δ/kT[sub c]=4–4.5 with U/t=8. The agreement between the phase diagram found and experiment is discussed. © 1998 American Institute of Physics.
- Subjects
SUPERCONDUCTIVITY; SYMMETRY (Physics)
- Publication
JETP Letters, 1998, Vol 67, Issue 5, p369
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.567676