Seminarium Fizyki Materii Skondensowanej

LaCoO3 is a classic material that has been studied since 1950's and still hosts new surprises.Recent RIXS experiments, which allowed for the first time a direct observation ofso called intermediate spin (IS) excitations, revealed their unexpectedly large mobility.Repeated RIXS measurements with the state-of-art energy resolution allowed us not onlyto map out the IS dispersion more precisely, but also to study the damping of IS excitations at elevated temperatures. I will derive an effective strong-coupling model of LaCoO3 and present its treatmentusing bosonic dynamical mean-field theory (B-DMFT). To account for the local hard-core constraintson the bosonic particles we have introduced HB-DMFT (DMFT for hard-core bosons) approach, whichis analogous to the concept of extremely correlated Fermi liquid introduced by Shastry to treatthe fermionic t-J model. I will discuss possible further developments of the method and its potentialto answer the remaining open questions concerning LaCoO3. Join Zoom Meetinghttps://us02web.zoom.us/j/83686899432?pwd=RXNtZkhtZFpLazVmMVRFY1BtVlI0Zz09Meeting ID: 836 8689 9432Passcode: cond-matt