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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Hierarchy of Lifshitz transitions in the surface electronic structure of Sr2RuO4 under uniaxial compression Edgar Abarca Morales , Gesa-R. Siemann , Andela Zivanovic , Philip A. E. Murgatroyd , Igor Markovic , Brendan Edwards , Chris A. Hooley , Dmitry A. Sokolov , Naoki Kikugawa , Cephise Cacho , Matthew D. Watson , Timur K. Kim , Clifford W. Hicks , Andrew P. Mackenzie , Phil D. C. King Physical Review Letters 130 DOI: 10.1103/PhysRevLett.130.096401 Diamond Proposal Number(s): [27471, 28412] Show Abstract ▼ Abstract: We report the evolution of the electronic structure at the surface of the layered perovskite Sr 2 RuO 4 under large in-plane uniaxial compression, leading to anisotropic B 1 g strains of ϵ x x − ϵ y y = − 0.9 ± 0.1 % . From angle-resolved photoemission, we show how this drives a sequence of Lifshitz transitions, reshaping the low-energy electronic structure and the rich spectrum of van Hove singularities that the surface layer of Sr 2 RuO 4 hosts. From comparison to tight-binding modeling, we find that the strain is accommodated predominantly by bond-length changes rather than modifications of octahedral tilt and rotation angles. Our study sheds new light on the nature of structural distortions at oxide surfaces, and how targeted control of these can be used to tune density of state singularities to the Fermi level, in turn paving the way to the possible realization of rich collective states at the Sr 2 RuO 4 surface.	Feb 2023
I05-ARPES	Direct observation of a uniaxial stress-driven Lifshitz transition in Sr2RuO4 Veronika Sunko , Edgar Abarca Morales , Igor Markovic , Mark E. Barber , Dijana Milosavljević , Federico Mazzola , Dmitry A. Sokolov , Naoki Kikugawa , Cephise Cacho , Pavel Dudin , Helge Rosner , Clifford Hicks , Philip D. C. King , Andrew P. Mackenzie Npj Quantum Materials 4 DOI: 10.1038/s41535-019-0185-9 Diamond Proposal Number(s): [20427] Open Access Show Abstract ▼ 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.	Dec 2019

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