Dependence of the critical temperature of high-temperature cuprate superconductors on hoppings and spin correlations between CuO{sub 2} planes
Journal Article
·
· Journal of Experimental and Theoretical Physics
- Russian Academy of Sciences, Kirensky Institute of Physics, Siberian Branch (Russian Federation)
The influence of interlayer hoppings on the superconducting transition temperature (T{sub c}) in bilayer cuprates has been studied. The parameter of hopping between layers is expressed as t{sub Up-Tack }(k) = t{sub Up-Tack }(cos(k{sub x}) - cos(k{sub y})){sup 2} and treated as a small perturbation for the states of two CuO{sub 2} planes described by the t-t Prime -t Double-Prime -J* model. In the generalized mean field approximation for d{sub x}{sup 2} - y{sup 2} symmetry of the superconducting gap, neither the interlayer hopping or exchange interaction, nor the pair hopping between CuO{sub 2} layers provides an additional mechanism of Cooper pair formation or an increase in T{sub c}. In the concentration dependence of T{sub c}, the bilayer splitting of the upper Hubbard band of quasi-holes is manifested as two peaks with temperatures slightly lower than the maximum T{sub c} for a single-layer cuprate. Interlayer antiferromagnetic spin correlations suppress bilayer splitting.
- OSTI ID:
- 22027913
- Journal Information:
- Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 2 Vol. 114; ISSN JTPHES; ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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