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- W2081105211 abstract "With the use of the spin-wave and Born approximations the energy spectrum of the two-dimensional t-J model is self-consistently calculated in the range of hole concentrations, 0ensuremath{leqslant}xensuremath{lesssim}0.3. The anomalous magnon Green's functions, which arise due to the hole-magnon interaction, are taken into consideration. They lead to a sharp transition from short-range antiferromagnetic order to a completely disordered paramagnetic state at xensuremath{approx}0.19, in addition to the transition from long-range to short-range antiferromagnetic order at xensuremath{approx}0.02--0.04. In the region of hole concentrations 0.04ensuremath{lesssim}xensuremath{lesssim}0.19 the obtained shape of the Fermi surface, the hole dispersion near the Fermi level, and the density of states on it are in satisfactory agreement with experiment in ${mathrm{La}}_{2mathrm{ensuremath{-}}mathrm{x}}$${mathrm{Sr}}_{mathrm{x}}$${mathrm{CuO}}_{4}$ and Bi2212. The Eliashberg formalism is used for calculating ${mathrm{T}}_{mathrm{c}}$. The hole-magnon interaction is found to be unable alone to give rise to superconductivity. By adding a moderate interaction with apex oxygen vibrations high ${mathrm{T}}_{mathrm{c}}$'s are obtained for even-frequency ${mathrm{d}}_{{mathrm{x}}^{2}mathrm{ensuremath{-}}{mathrm{y}}^{2}}$ pairing in the range 0.04ensuremath{lesssim}xensuremath{lesssim}0.19. For larger hole concentrations the odd-frequency s-wave solution becomes the leading one which can lead to s-wave superconductivity in the overdoped regime with the participation of a hole-phonon interaction of the respective symmetry." @default.
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- W2081105211 date "1997-01-01" @default.
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- W2081105211 title "Magnetic transitions and superconductivity in the t-J model" @default.
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- W2081105211 doi "https://doi.org/10.1103/physrevb.55.582" @default.
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