An effective Hamiltonian and its phase diagram for T'-structure cuprates

29th International Symposium on Superconductivity

Yamazaki, Kunito^1 ; Yoshioka, Takuya^1 ; Tsuchiura, Hiroki^1,2 ; Ogata, Masao^3

Department of Applied Physics, Tohoku University, Sendai

980-8579, Japan^1

Center for Spintronics Research Network, Tohoku University, Sendai

980-8577, Japan^2

Department of Physics, University of Tokyo, Bunkyo, Tokyo

113-0033, Japan^3

关键词: D-wave superconductivity;    Effective Hamiltonian;    Electron doped cuprates;    Eliashberg equations;    Energy differences;    Superconducting transitions;    T'-structure;    Two-band model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012009/pdf
DOI  :  10.1088/1742-6596/871/1/012009

来源: IOP

【 摘 要 】

We study the superconducting transition near the half-filling of electron-doped cuprates with the so-called T'-structure based on an effective two-band model using uctuation-exchange approximation and solving the linearized Eliashberg equation. We find d-wave superconductivity even at the half-filling of this model when the energy difference between the upper Hubbard level of Cu dx2-y2orbitals and O 2p levels is less than about 1.5eV, which is plausible for the T'-type cuprates.