Angle-resolved photoemission study of untwinned PrBa$_2$Cu$_3$O$_7$: undoped CuO$_2$ plane and doped CuO$_3$ chain

  title={Angle-resolved photoemission study of untwinned PrBa\$\_2\$Cu\$\_3\$O\$\_7\$: undoped CuO\$\_2\$ plane and doped CuO\$\_3\$ chain},
  author={T.Mizokawa and and Z.-X.Shen and A.Ino and A.Fujimori and M.Goto and H.Eisaki and S.Uchida and M.Tagami and K.Yoshida and A.I.Rykov and Y.Siohara and K.Tomimoto and S.Tajima},
We have performed an angle-resolved photoemission study on untwinned PrBa$_2$Cu$_3$O$_7$, which has low resistivity but does not show superconductivity. We have observed a dispersive feature with a band maximum around ($\pi$/2,$\pi$/2), indicating that this band is derived from the undoped CuO$_2$ plane. We have observed another dispersive band exhibiting one-dimensional character, which we attribute to signals from the doped CuO$_3$ chain. The overall band dispersion of the one-dimensional…