## Abstract

We have performed high-resolution angle-resolved photoemission spectroscopy on single crystal Sr_{2}RuO_{4}. at low temperature. We observed that the dispersion of energy bands near the Fermi level (E_{F}) is about two times smaller than the band calculation. One band forms an extended van-Hove singularity (vHs) near E_{F} around the midpoint between F and Z point like in cuprate superconductors, regardless of the character of electronic states near E_{F}. The observed Fermi surface topology (one electron-like Fermi surface sheet centered at Γ point and two hole-like ones centered at X point) is qualitatively different from the calculated Fermi surface topology (two electron-like fermi sheets centered at Γ point and one hole-like one centered at X point), though the observed total electron count seems to be conserved. These results suggest that the extended vHs may be a general electronic structure of correlated two-dimensional metals and the correlation effect may change the Fermi surface topology as well as the band dispersion.

Original language | English |
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Pages (from-to) | 377-379 |

Number of pages | 3 |

Journal | Physica B: Condensed Matter |

Volume | 237-238 |

DOIs | |

Publication status | Published - 1997 Jul |

## Keywords

- Angle-resolved photoemission spectroscopy
- Extended Van Hove singularity
- Fermi surface topology
- SrRuO

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