Giant lattice softening at a Lifshitz transition in Sr<sub>2</sub>RuO<sub>4</sub>.
biomechanical · Level V
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- Record sourced from PubMed, PMID 37883549.
- Also identified by DOI 10.1126/science.adf3348.
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Abstract
The interplay of electronic and structural degrees of freedom in solids is a topic of intense research. More than 60 years ago, Lifshitz discussed a counterintuitive possibility: lattice softening driven by conduction electrons at topological Fermi surface transitions. The effect that he predicted, however, was small and has not been convincingly observed. Using a piezo-based uniaxial pressure cell to tune the ultraclean metal strontium ruthenate while measuring the stress-strain relationship, we reveal a huge softening of the Young's modulus at a Lifshitz transition of a two-dimensional Fermi surface and show that it is indeed driven entirely by the conduction electrons of the relevant energy band.