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Direct observation of a uniaxial stress-driven Lifshitz transition in Sr2RuO4

DOI: 10.1038/s41535-019-0185-9 DOI Help

Authors: Veronika Sunko (Max Planck Institute for Chemical Physics of Solids; University of St. Andrews) , Edgar Abarca Morales (Max Planck Institute for Chemical Physics of Solids; University of St. Andrews) , Igor Markovic (Max Planck Institute for Chemical Physics of Solids; University of St. Andrews) , Mark E. Barber (Max Planck Institute for Chemical Physics of Solids) , Dijana Milosavljević (Max Planck Institute for Chemical Physics of Solids) , Federico Mazzola (University of St. Andrews) , Dmitry A. Sokolov (Max Planck Institute for Chemical Physics of Solids) , Naoki Kikugawa (National Institute for Materials Science) , Cephise Cacho (Diamond Light Source) , Pavel Dudin (Diamond Light Source) , Helge Rosner (Max Planck Institute for Chemical Physics of Solids) , Clifford Hicks (Max Planck Institute for Chemical Physics of Solids (MPI CPfS)) , Philip D. C. King (University of St. Andrews) , Andrew P. Mackenzie (Max Planck Institute for Chemical Physics of Solids; University of St. Andrews)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Npj Quantum Materials , VOL 4

State: Published (Approved)
Published: December 2019
Diamond Proposal Number(s): 20427

Open Access Open Access

Abstract: Pressure represents a clean tuning parameter for traversing the complex phase diagrams of interacting electron systems, and as such has proved of key importance in the study of quantum materials. Application of controlled uniaxial pressure has recently been shown to more than double the transition temperature of the unconventional superconductor Sr2RuO4, leading to a pronounced peak in Tc versus strain whose origin is still under active debate. Here we develop a simple and compact method to passively apply large uniaxial pressures in restricted sample environments, and utilise this to study the evolution of the electronic structure of Sr2RuO4 using angle-resolved photoemission. We directly visualise how uniaxial stress drives a Lifshitz transition of the γ-band Fermi surface, pointing to the key role of strain-tuning its associated van Hove singularity to the Fermi level in mediating the peak in Tc. Our measurements provide stringent constraints for theoretical models of the strain-tuned electronic structure evolution of Sr2RuO4. More generally, our experimental approach opens the door to future studies of strain-tuned phase transitions not only using photoemission but also other experimental techniques where large pressure cells or piezoelectric-based devices may be difficult to implement.

Subject Areas: Materials, Physics


Instruments: I05-ARPES

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s41535-019-0185-9.pdf