Giant lattice softening at a Lifshitz transition in Sr2RuO4

• 成果类型: Article
• 署名作者: Noad, H. M. L.; Ishida, K.; Li, Y. -S.; Gati, E.; Stangier, V.; Kikugawa, N.; Sokolov, D. A.; Nicklas, M.; Kim, B.; Mazin, I. I.; Garst, M.; Schmalian, J.; Mackenzie, A. P.; Hicks, C. W.
• 署名单位: Max Planck Society; Helmholtz Association; Karlsruhe Institute of Technology; National Institute for Materials Science; Kunsan National University; Kyungpook National University (KNU); George Mason University; George Mason University; Helmholtz Association; Karlsruhe Institute of Technology; Helmholtz Association; Karlsruhe Institute of Technology; University of St Andrews; University of Birmingham
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11478
• DOI: 10.1126/science.adf3348
• 发表日期: 2023-10-27
• 页码: 447-450
• 关键词: superconductivity; collapse; metal

摘要

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.