Adiabatic variation of the charge-density-wave phase diagram in the 123 cuprate (Ca$_x$La$_{1-x}$)(Ba$_{1.75-x}$La$_{0.25+x}$)Cu$_3$O$_y$

M. Bluschke; M. Yaari; E. Schierle; G. Bazalitsky; J. Werner; E. Weschke; A. Keren

doi:10.1103/PhysRevB.100.035129

paper

Adiabatic variation of the charge-density-wave phase diagram in the 123 cuprate (Ca $_{x}$ La $_{1 - x}$ )(Ba $_{1.75 - x}$ La $_{0.25 + x}$ )Cu $_{3}$ O $_{y}$

arXiv:1906.05021 · doi:10.1103/PhysRevB.100.035129

Abstract

In order to explain the emergence of the anomalous pseudogap state and high-temperature superconductivity in the cuprates, intense research activity over three decades has focused on unravelling the connection between the various instabilities of the underdoped regime. In the high-temperature superconductor (Ca $_{x}$ La $_{1 - x}$ )(Ba $_{1.75 - x}$ La $_{0.25 + x}$ )Cu $_{3}$ O $_{y}$ (CLBLCO) isovalent chemical substitution produces smooth changes to the CuO $_{2}$ plane buckling and the Cu(II)-to-apical-oxygen distance, allowing us to study the interdependence of charge-density-wave (CDW) order, superconductivity and the pseudogap at constant hole doping in two adiabatically connected representations of the 123 cuprate structure. In this study, resonant soft x-ray scattering measurements reveal the first observation of incommensurate CDW correlations in CLBLCO and demonstrate a lack of correlation between $T_{CDW}$ and the pseudogap crossover temperature ( $T^{*}$ ). This result disfavours a scenario in which the opening of the pseudogap at $T^{*}$ results from fluctuating CDW correlations.

Adiabatic variation of the charge-density-wave phase diagram in the 123 cuprate (Cax​La1−x​)(Ba1.75−x​La0.25+x​)Cu3​Oy​

Abstract

Adiabatic variation of the charge-density-wave phase diagram in the 123 cuprate (Ca $_{x}$ La $_{1 - x}$ )(Ba $_{1.75 - x}$ La $_{0.25 + x}$ )Cu $_{3}$ O $_{y}$