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SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Ruthenates

TT 37.4: Vortrag

Mittwoch, 29. März 2023, 15:45–16:00, HSZ 201

Giant lattice softening at a Lifshitz transition in the normal state of Sr2RuO4 — •Hilary M. L. Noad1, Kousuke Ishida1, You-Sheng Li1, Veronika Stangier2, Naoki Kikugawa3, Dmitry A. Sokolov1, Bongjae Kim4, Igor I. Mazin5, Markus Garst2, Jörg Schmalian2, Andrew P. Mackenzie1,6, and Clifford W. Hicks1,71Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Karlsruhe Institute of Technology, Karlsruhe, Germany — 3National Institute for Materials Science, Tsukuba, Japan — 4Kunsan National University, Gunsan, Korea — 5George Mason University, Fairfax, USA — 6University of St Andrews, St Andrews, UK — 7University of Birmingham, Birmingham, UK

The interplay between lattice and electronic degrees of freedom is a central theme in condensed matter physics. In Sr2RuO4, the quasi-two-dimensional Fermi surface can be tuned through a Lifshitz transition—a change in its topology—with uniaxial pressure along the ⟨100⟩ direction. We investigated the influence of this electronic transition on the lattice by using a piezo-based uniaxial pressure cell to measure the stress-strain relation of Sr2RuO4 across the Lifshitz transition. We find a large and strongly temperature-dependent softening of the [100] Young’s modulus at the Lifshitz transition. From thermodynamic arguments and comparison to a tight-binding model, we establish that the softening is indeed driven by conduction electrons.

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