### Abstract

We report angle resolved photoemission (ARPES) studies on electron-doped cuprate superconductor Sm_{2 - x} Ce_{x} CuO_{4} (x = 0.14 and 0.18). A wide energy range scan shows clear "waterfall" effect at an energy scale close to 500 meV which is consistent with the value found in Nd_{2 - x} Ce_{x} CuO_{4} (NCCO) but larger than that from hole-doped superconductors. High resolution results from both dopings show pseudo-gap effects that were observed in NCCO. However, the effects are found to be stronger than that observed in optimally doped NCCO. The overall electronic structure is well understood within a simple model in which a sqrt(2) × sqrt(2) static order is assumed. Both ARPES and optical measurements give the coupling strengths to the Q=(π / 2, π / 2) (due to the sqrt(2) × sqrt(2) order) to be about 0.1 eV, compatible with each other. The effect is strong enough to push the band near the nodal region below the Fermi energy, resulting in possible nodeless d-wave superconductivity where zero energy quasi-particle excitation is inhibited.

Original language | English |
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Pages (from-to) | 2939-2943 |

Number of pages | 5 |

Journal | Journal of Physics and Chemistry of Solids |

Volume | 69 |

Issue number | 12 |

DOIs | |

Publication status | Published - 2008 Dec |

### All Science Journal Classification (ASJC) codes

- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics

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## Cite this

*Journal of Physics and Chemistry of Solids*,

*69*(12), 2939-2943. https://doi.org/10.1016/j.jpcs.2008.06.116