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SUMMARY:Special Seminar: Quasiparticle interference imaging of magnetic-field tuned states in the strontium ruthenates. Peter Wahl\, University of St Andrews.
DESCRIPTION:Speaker: Peter Wahl\, University of St Andrews and University of Bonn. \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: The phenomenology and radical changes seen in materials properties traversing a quantum phase transition has captivated condensed matter research over the past decades. Strong electronic correlations lead to novel ground states\, including magnetic order\, nematicity and unconventional superconductivity. To provide a microscopic model for these requires knowledge of the electronic structure in the vicinity of the Fermi energy. The strontium ruthenates provide a family of ideal model systems to explore this physics using spectroscopic techniques: they exhibit a quasi-two-dimensional electronic structure and occur as single-\, double- and triple-layer compounds with similar crystal structure but disparate ground states ranging from unconventional superconductivity via metamagnetism to itinerant ferromagnetism. In the metamagnetic compounds\, spectroscopic information about the low energy electronic structure would allow verification of different scenarios that have been proposed to explain their exotic properties. I will present spectroscopic imaging of the electronic structure performed at temperatures down to 100mK1 and in vector-magnetic fields\, and discuss the implications for the low energy electronic structure. Notably\, for several of the strontium ruthenates the surface provides a platform to study the properties of the electronic structure under conditions not accessible in the bulk.2\,3 \nThis work was done in close collaboration with C.A. Marques\, L.C. Rhodes\, M. Naritsuka\, I. Benedičič\, as well as colleagues from the University of St Andrews\, CNR SPIN\, and the Max Planck Institute for the Chemical Physics of Solids. \n\nReferences:\n\n[1] Marques et al.\, Atomic-scale imaging of emergent order at a magnetic-field-induced Lifshitz transition\, Sci. Adv. 8\, eabo7757 (2022). \n[2] Kreisel et al.\, Quasiparticle Interference of the van-Hove singularity in Sr2RuO4\, npj Quantum Materials 6\, 100 (2021). \n[3] Marques et al. Magnetic-Field Tunable Intertwined Checkerboard Charge Order and Nematicity in the Surface Layer of Sr2RuO4. Adv. Mat. 33\, 2100593 (2021).
URL:https://qmi.ubc.ca/event/special-seminar-quasiparticle-interference-imaging-of-magnetic-field-tuned-states-in-the-strontium-ruthenates-peter-wahl-university-of-st-andrews/
LOCATION:BRIM 311\, 2355 East Mall\, Vancouver\, British Columbia\, V6T 1Z4\, Canada
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