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Thursday, September 23, 2021 at 3:15 pm

To be held over Zoom

Host: ZX Shen

Bernard Keimer
Max Planck Institute, Germany

Strain as an exploratory tool for cuprate high-temperature superconductors
We will discuss how strain tuning can open up new regimes of the phase diagram of cuprate high-temperature superconductors. Elastic and inelastic x-ray scattering experiments YBa2Cu3O6+x have demonstrated that uniaxial strain enhances two-dimensional charge order and induces a three-dimensional charge density wave that competes strongly against superconductivity [1]. We will also show initial results of measurements designed to establish a correspondence between the atomic-scale charge correlations and the macroscopic transport properties under uniaxial strain. Finally, we will show that stabilization by epitaxial strain allows the synthesis of highly overdoped La2-xBaxCuO4 films with lower levels of disorder than in other "214" superconductors [2]. The persistence of superconductivity beyond the superconducting "dome" in the phase diagram of other 214 compounds suggests that doping-induced disorder is the leading cause of the disappearance of superconductivity at high doping levels.