Adiabatic variation of the charge-density-wave phase diagram in the 123 cuprate (CaLa)(BaLa)CuO
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 (CaLa)(BaLa)CuO (CLBLCO) isovalent chemical substitution produces smooth changes to the CuO 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 and the pseudogap crossover temperature (). This result disfavours a scenario in which the opening of the pseudogap at results from fluctuating CDW correlations.
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