کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1867098 | 1038167 | 2012 | 4 صفحه PDF | دانلود رایگان |
Starting from a generalized Hubbard model with correlated-hopping interactions, we solve numerically two coupled integral equations within the Bardeen–Cooper–Schrieffer formalism, in order to study the doping effects on the critical temperature (TcTc), d-wave superconducting gap, and the electronic specific heat. Within the mean-field approximation, we determine the single- and correlated-electron-hopping parameters for La2 − xSrxCuO4 by using angle-resolved photoemission spectroscopy data. The resulting parametrized Hubbard model is able to explain the experimental TcTc variation with the doping level (x). Moreover, the observed power-law behavior of the superconducting specific heat is reproduced by this correlated-hopping Hubbard model without adjustable parameters.
► We obtain d -wave superconductivity from correlated-hopping interactions.
► The model parameters are fitted by using the ARPES data.
► This model is able to explain the TcTc and specific heat behaviors of La2 − xSrxCuO4.
Journal: Physics Letters A - Volume 376, Issue 16, 19 March 2012, Pages 1380–1383