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- W2014237035 abstract "Using an advanced version of the renormalized mean-field theory for the $t$-$J$ model, we examine the spin-singlet superconducting (SC) state of ${d}_{{x}^{2}ensuremath{-}{y}^{2}}$ symmetry. Overall doping dependence of the SC gap magnitude is in good agreement with experimental results for ${text{Bi}}_{2}{text{Sr}}_{2}text{Ca}{text{Cu}}_{2}{text{O}}_{8+ensuremath{delta}}$ and ${text{La}}_{2ensuremath{-}x}{text{Sr}}_{x}text{Cu}{text{O}}_{4}$ compounds at the optimal doping and in the overdoped regime. We also calculate the dispersion relation for the Bogoliubov quasiparticles and compare our findings both with the angle-resolved photoemission data for the cuprates as well as with the variational Monte Carlo and other mean-field studies. Within the method proposed by Fukushima [Phys. Rev. B 78, 115105 (2008)], we analyze different forms of the $t$-$J$ Hamiltonian, i.e., modifications caused by the form of exchange interaction, and by the presence of three-site terms. It is shown that although the former has a small influence, the latter suppresses strongly the superconductivity. We also analyze the temperature dependence of the gap magnitude and compare the results with those of the recently introduced finite-temperature renormalized mean-field theory of Wang et al. [Phys. Rev. B 82, 125105 (2010)]." @default.
- W2014237035 created "2016-06-24" @default.
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- W2014237035 date "2011-03-18" @default.
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- W2014237035 title "Renormalized mean-field<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>t</mml:mi><mml:mo>−</mml:mo><mml:mi>J</mml:mi></mml:mrow></mml:math>model of high-<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi>T</mml:mi><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductivity: Comparison to experiment" @default.
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- W2014237035 doi "https://doi.org/10.1103/physrevb.83.104512" @default.
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