Study of HgBa${}_2$CuO${}_{4+\delta }$ by Angle-Resolved Photoemission Spectroscopy

Abstract

We present the first angle-resolved photoemission measurement on the single-layer Hg-based cuprate, HgBa${}_2$CuO${}_{4+\delta }$ (Hg1201). A quasi-particle peak in the spectrum and a kink in the band dispersion around the diagonal of the Brillouin zone are observed, whereas no structure is detected near the Brillouin zone boundary. To search for a material-dependent trend among hole-doped cuprates, including Hg1201, we use a tight-binding model to fit their Fermi surfaces. We find a positive correlation between the $T_{c,\max }$ and $t^{\prime }/t$, consistent with theoretical predictions.

5 pages, 4 figures

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