Charge order in the Pr substituted YBa$_2$Cu$_3$O$_7$ from high-field Hall effect measurements

TL;DR

This study uses high-field Hall effect measurements to reveal charge order and Fermi surface reconstruction in Pr-substituted YBCO, highlighting the role of charge carrier concentration over doping mechanism in electronic order formation.

Contribution

It demonstrates the presence of 2D charge order in Pr-YBCO and compares its phase diagram to YBCO, emphasizing the importance of charge carrier density.

Findings

Signatures of Fermi surface reconstruction in Pr-YBCO

Symmetric phase diagrams despite different doping methods

Charge carrier density governs electronic orders

Abstract

The mechanism of doping in the composite Pr$_x$Y$_{1-x}$Ba$_2$Cu$_3$O$_{7-\delta}$ (Pr-YBCO) system is distinct from that of pure YBCO, offering a means to explore the requirements for the numerous electronic orders appearing in the phase diagram. One such example is the ubiquitous 2D charge order and concomitant Fermi surface reconstruction in underdoped YBCO. Here, using magnetotransport and Hall effect measurements, we find signatures of a Fermi surface reconstruction similar to that in pure YBCO indicating the presence of 2D charge order in Pr-YBCO. Additionally, we find that the phase diagrams of Pr-YBCO and YBCO are decidedly symmetric despite the additional disorder in the former and the distinction between hole depletion through Pr substitution and through O reduction. This indicates that while the mechanism of doping differs, the amount of charge carriers in the planes is the most important factor governing the electronic orders in these systems.