Theory for Electron-Doped Cuprate Superconductors: d-wave symmetry order parameter

Details Theory for Electron-Doped Cuprate Superconductors: d-wave symmetry order parameter Theory for Electron-Doped Cuprate Superconductors: d-wave symmetry order parameter

2000-04-26

arxiv.org/abs/cond-mat/0004453v1

Phys. Rev. B 62, 13922 (2000)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.62.13922

Using as a model the Hubbard Hamiltonian we determine various basic properties of electron-doped cuprate superconductors like ${Nd}_{2-x}{Ce}_{x}{CuO}_{4}$ and ${Pr}_{2-x}{Ce}_{x}{CuO}_{4}$ for a spin-fluctuation-induced pairing mechanism. Most importantly we find a narrow range of superconductivity and like for hole-doped cuprates $d_{x^{2}-y^{2}}$ - symmetry for the superconducting order parameter. The superconducting transition temperatures $T_{c}(x)$ for various electron doping concentrations $x$ are calculated to be much smaller than for hole-doped cuprates due to the different Fermi surface and a flat band well below the Fermi level. Lattice disorder may sensitively distort the symmetry $d_{x^{2}-y^{2}}$ via electron-phonon interaction.

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