Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 98: Altermagnets
TT 98.3: Talk
Friday, March 13, 2026, 10:00–10:15, CHE/0091
Effect of pressure on the electronic properties of the Kagome flat band metal CsCr3Sb5 — •Maria Chatzieleftheriou1,2, Jonas B. Profe1, Ying Li3, and Roser Valentí1 — 1Institute for Theoretical Physics, Goethe University Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt a.M., Germany — 2CNRS, CPHT, Ecole polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France — 3MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi’an Jiaotong University, Xi’an 710049, China
CsCr3Sb5 is a novel type of strongly correlated Kagome superconductor. The material shows non-Fermi liquid like behavior at high temperatures, indicating strong correlations and has an intertwined charge and spin density wave ordering below T 54K. Under external pressure, this order is suppressed and a superconducting phase emerges. This phase diagram in combination with a Kagome flat band near the Fermi-level and potential altermagnetic orders has led to a plethora of theoretical and experimental studies. In this work, we perform a systematic analysis of the changes of the electronic properties induced by pressure. To this end we employ DFT+DMFT calculations revealing a complex interplay of the position of the flat bands and the strength of correlations. Our results support the predominant interpretation that pressure effectively reduces the strength of correlations by stronger hybridization between the orbitals. This finding strongly suggests that the superconducting order is emerging due to short range fluctuations present in the system once the ordered state is suppressed sufficiently.
Keywords: strongly correlated systems; Kagome metals; flat bands; DFT+DMFT