Abstract
The interplay between superconductivity (SC) and antiferromagnetism (AFM) is studied in strongly correlated systems of high T c Cuprate superconductors. It is assumed that superconductivity arises due to BCS pairing mechanism in presence of AFM in Cu lattices of Cu-O planes. The total Hamiltonian of the system is mean field one and has been solved exactly by writing the equations of motion for the single particle Green’s functions. Equations for the appropriate single particle co-relation functions are derived and the order parameters corresponding to SC and AFM are determined. It is assumed that the Fermi energy ∈ F = 0 and the renormalized localized f energy level coincide with the Fermi level. All the quantities in the final equation for h and Δ are made dimensionless by dividing by 2t, where t is the hopping integral. The temperature dependent values of staggered magnetic field (h) and SC gap (Δ) were determined by solving self-consistent equations for h and Δ. The quasiparticle energy bands are function of AFM gap (h), SC gap (Δ) and hybridization (V). Then the dispersion of quasi-particles are studied at different temperatures by considering temperature dependent values of h and Δ and varying other different model parameters.
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References
M Tovar, S Obradors and S B Oseroff Phys. Rev. B45 4729 (1992)
Y Tokura, H Tagaki and S Uchida Nature 337 345 (1989)
H B Radousky J. Mater. Res. 7 1917 (1992)
A Schilling, F Hulliger, S Sawarappuli and H R Ott Matter. Lett. 11 127 (1991)
J G Bednorz and K A Muller J. Phys. B64 189 (1986)
M Nantoth et al, Physica C185 861 (1994)
T Matsumoto et al, Physica C189 1907 (1991)
N Tsuda, D Shimanda and N Miyakawa Physica C185 903 (1991)
L N Bulaevskii et al, Supercond. Sci. Technol. 1 205 (1988)
J F Zasadzinski et al, In electron-phonon Interaction in Oxide Superconductors (ed) R Baquero (Singapore: World Scientific) p46 (1991); Phys. Rev. Lett. 59 912 (1991)
P Fulde J. Low Temp. Phys. 95 45 (1994)
D N Zubarev Sov. Physics. Usp. 95 71 (1960)
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Panda, B.N., Sahoo, B.K. & Rout, G.C. Dispersion of quasi-particles in high T c cuprates. Indian J Phys 83, 447–454 (2009). https://doi.org/10.1007/s12648-009-0025-z
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DOI: https://doi.org/10.1007/s12648-009-0025-z