Berlin 2015 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 30: Correlated Electrons: Spin Systems and Itinerant Magnets – Frustrated Magnets 3 (jointly with MA)
TT 30.11: Talk
Tuesday, March 17, 2015, 12:15–12:30, H 0110
Propagation of the spin-orbit exciton due to the Jahn-Teller effect in systems with strong on-site spin-orbit coupling — •Ekaterina Plotnikova1, Maria Daghofer2, Jeroen van den Brink1, and Krzysztof Wohlfeld3,4 — 1IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany — 2University of Stuttgart Pfaffenwaldring 57 D-70550 Stuttgart — 3Stanford University and SLAC National Accelerator Laboratory, 2575 Sand Hill Rd, Menlo Park, CA 94025 USA — 4Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Pasteura 5, PL-02093 Warsaw, Poland
In this work we study the interplay between the strong spin-orbit coupling and electron-phonon interaction in the strongly correlated transition metal oxides with partially filled 5d shells. We show that even relatively weak electron-phonon coupling may lead to qualitatively different physics of the 5d oxides than the one discussed so far. Thus, we derive the effective interaction between the j `spin-orbit' coupled isospins which follows from the orbital-only interaction induced by the cooperative Jahn-Teller effect. Next, we show that such interaction may lead to a novel type of propagation of the j = 3/2 spin-orbit exciton in the ordered j = 1/2 antiferromagnet which, unlike in the pure superexchange model does not require coupling to the j =1/2 `magnon' excitations.