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

TL;DR

This study uses angle-resolved photoemission to analyze the electronic structure of untwinned PrBa2Cu3O7, revealing dispersive bands from CuO2 planes and CuO3 chains, with implications for understanding cuprate physics.

Contribution

It provides the first detailed ARPES characterization of untwinned PrBa2Cu3O7, distinguishing contributions from CuO2 planes and CuO3 chains, and compares experimental data with theoretical models.

Findings

Dispersive band from CuO2 plane with maximum at (π/2,π/2)

One-dimensional band from CuO3 chain consistent with t-J model

Suppressed spectral intensity near the Fermi level

Abstract

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 band agrees with the prediction of $t-J$ model calculation with parameters relevant to cuprates except that the intensity near the Fermi level is considerably suppressed in the experiment.