Angular dependence of the superconducting order parameter in electron-doped high-temperature superconductors

The superconducting order parameter in electron-doped high-temperature superconductors is calculated by fluctuation exchange approximation applied to a two-dimensional Hubbard model. In contrast to hole-doped cases, the so-called hot spots are located near the diagonals of the Brillouin zone in the...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2004-08, Vol.73 (8), p.2057-2060
Main Authors: YOSHIMURA, Hiromasa, HIRASHIMA, Dai S
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cuprates superconductors (high tc and insulating parent compounds)
Exact sciences and technology
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Physics
Superconductivity
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Summary:The superconducting order parameter in electron-doped high-temperature superconductors is calculated by fluctuation exchange approximation applied to a two-dimensional Hubbard model. In contrast to hole-doped cases, the so-called hot spots are located near the diagonals of the Brillouin zone in the electron-doped superconductors; this is found to result in the nonmonotonic angular dependence of the order parameter of dx2-y2 symmetry. This agrees with the implication obtained from electronic Raman scattering experiments, and the direct observation of this angular dependence is direct evidence of the superconductivity induced by antiferromagnetic spin fluctuations.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.73.2057