Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 5: Superconductivity: Sample Preparation and Characterization
TT 5.10: Talk
Monday, March 9, 2026, 12:00–12:15, CHE/0089
Atomic scale imaging of the effect of chemical pressure in Sr2−xBaxRuO4 — •Siri A. Berge1, Rebecca Bisset1, Daniel Halliday1, Carolina de Almeida Marques1, Luke C. Rhodes1, Alexander C. Komarek2, Phil D. C. King1, and Peter Wahl1,3 — 1SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, United Kingdom — 2Max Planck Institute for Chemical Physics of Solids Nöthnitzer Strasse 40, Dresden 01187, Germany — 3Physikalisches Institut, Universitat Bonn, Nussallee 12, 53115 Bonn, Germany
Tuning the electronic structure of layered perovskites is a powerful pathway to control their properties for future applications. Structural distortion in Sr2RuO4 affects the electronic structure, moving the van Hove singularity across the Fermi level, with significant consequences for physical properties such as superconductivity [1-2]. Here, we study the effect of chemical pressure by substitution with isovalent Ba atoms in Sr2−xBaxRuO4 for x = 0, 0.2, and 0.4 by Scanning Tunnelling Microscopy (STM). We report changes in the electronic structure with rotation of the surface RuO octahedra as well as surface inhomogeneity with regions of varying degrees of rotation. Our results highlight the connection between electronic and lattice degrees of freedom and demonstrate control of the electronic structure.
[1] C.A. Marques et al. Advanced Materials 33 (2021) 2100593
[2] J.B. Profe et al. Phys. Rev. Research 6 (2024) 043057
Keywords: strontium ruthenate; scanning tunnelling microscopy