Lanthanide substitution effects in electron-doped high-Tc superconductors studied by angle-resolved photoemission spectroscopy

Details Lanthanide substitution effects in electron-doped high-Tc superconductors studied by angle-resolved photoemission spectroscopy Lanthanide substitution effects in electron-doped high-Tc superconductors studied by angle-resolved photoemission spectroscopy

2006-12-28

arxiv.org/abs/cond-mat/0612660v1

J. Supercond. Nov. Mag. 20, 563 (2007)

Physics

Condensed Matter

Superconductivity

submitted to J. of Superconductivity (Proceedings of Stripes 2006)

Scientific paper

We have performed an angle-resolved photoemission study of the electron-doped high-Tc superconductors (HTSCs) Sm_{1.85}Ce_{0.15}CuO_{4} (SCCO) and Eu_{1.85}Ce_{0.15}CuO_{4} (ECCO). Around the nodal point (pi/2, pi/2), we observed an energy gap at the Fermi level (EF) for both samples, resulting from the strong effects of antiferromagnetism. The magnitude of this gap in ECCO is larger than that in SCCO, implying that the effects of antiferromagnetism in ECCO are stronger than that in SCCO. Also, we quantitatively confirmed the effects of antiferromagnetism by the band dispersions to tight-binding calculation.

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