Study of HgBa2CuO4+δ by Angle-Resolved Photoemission Spectroscopy
W. S. Lee, T. Yoshida, W. Meevasana, K. M. Shen, D. H. Lu, W. L. Yang, X. J. Zhou, X. Zhao, G. Yu, Y. Cho, M. Greven, Z. Hussain, Z. -X. Shen
Abstract
We present the first angle-resolved photoemission measurement on the single-layer Hg-based cuprate, HgBa2CuO4+δ (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 Tc,max and t'/t, consistent with theoretical predictions.
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