Doping evolution of the pseudogap and charger order in Y_1-xPr_xBa₂Cu₃O_7-δ

Among the RBa₂Cu₃O₇ (R = Y or rare earth) family of cuprates, Pr-doping is unique in that it systematically suppresses the superconductivity. Recently, resonant x-ray scattering studies of Y_1-xPr_xBa₂Cu₃O_7-δ (YPrBCO) thin films observed an in-plane charge order whose onset temperature (T_CO) increases monotonically with Pr-doping all the way to the Mott insulator limit (x = 1) [1], unlike other doped cuprates. The pseudogap is another type of electronic order commonly seen in the cuprates, but its evolution with Pr-doping in YPrBCO is not well understood. In this talk, we present new measurements of the pseudogap onset temperature (T^*) made by electrical transport on YPrBCO thin films. We compare the evolution of T^* and T_CO versus Pr-doping, to elucidate the physical connection between these two types of order, and how they relate to the superconducting order over the entire phase diagram of YPrBCO. Finally, we examine spectral evidence for both the pseudogap and charge order, as manifested in such measurements as quasiparticle tunneling and angle-resolved photoemission spectroscopy.

[1] M. Kang et al., arXiv preprint arXiv:2203.08872 (2022)