Giant lattice softening at a Lifshitz transition in Sr2RuO4

H. M. L. Noad*, K. Ishida, Y.-S. Li, E. Gati, V. Stangier, N. Kikugawa, D. A. Sokolov, M. Nicklas, B. Kim, I. I. Mazin, M. Garst, J. Schmalian*, A. P. Mackenzie*, C. W. Hicks*

*Corresponding author for this work

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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.
Original languageEnglish
Pages (from-to)447-450
Number of pages4
JournalScience
Volume382
Issue number6669
DOIs
Publication statusPublished - 27 Oct 2023

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