SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 3: Superconductivity: Properties and Electronic Structure
TT 3.9: Vortrag
Montag, 27. März 2023, 11:45–12:00, HSZ 103
Annealeing microstructured crystals of cuprate superconductor Tl2Ba2CuO6−x — •Ayanesh Maiti1,2,3, Seunghyun Khim1, Carsten Putzke2, and Andrew P Mackenzie1,3 — 1Max Planck Institute for Chemical Physics of Solids, Dresden — 2Max Planck Institute for Structure and Dynamics of Matter, Hamburg — 3University of St Andrews, Scotland
Cuprates exhibit a variety of interesting physics that is not well understood, ranging from unconventional superconductivity to strange metal behaviour. Past experiments have mostly focused on underdoped cuprates that have complex phases due to competing orders. Studies with overdoped samples were limited by the rarity of candidate materials and the difficulty to probe crystals with surface reconstructions. Tl2Ba2CuO6−x is a naturally overdoped cuprate that can be grown with high enough purity to show quantum oscillations, and we can suppress the effects of surface reconstructions by using focused ion beam (FIB) microstructuring techniques. However, FIB procedures remove oxygen from the crystal surface and introduces inhomogeneities in samples, making it hard to study their intrinsic behavior. We are developing annealing techniques to re-homogenize our microstructures, using measurements of the doping-dependent high-temperature resistivity to monitor their oxygen content. This will allow us to study the overdoped part of the cuprate phase diagram and hence improve our understanding of unconventional superconductivity. Our techniques will also enable studies with the full range of doping on a single specimen, eliminating sample-to-sample variations from future experiments.