Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 43: Frustrated Magnets - Strong Spin-Orbit Coupling 2 (joint session TT/MA)

TT 43.7: Vortrag

Mittwoch, 18. März 2020, 16:45–17:00, HSZ 304

Excitonic Magnetism at the intersection of Spin-orbit coupling and crystal-field splittingTeresa Feldmaier1, Pascal Strobel1, Michael Schmid1,2, Philipp Hansmann3, and •Maria Daghofer11FMQ, Universität Stuttgart, Germany — 2IQST, Stuttgart and Ulm, Germany — 3MPI-CPfS, Dresden, Germany

Excitonic magnetism involving superpositions of singlet and triplet states is expected to arise for two holes in strongly correlated and spin-orbit coupled t2g orbitals. However, uncontested material examples for its realization are rare. Applying the Variational Cluster Approach to the square lattice, we find for weak spin-orbit coupling stripy spin antiferromagnetism combined with stripy orbital order without a crystal field and checkerboard spin antiferromagnetism when crystal field favors the xy orbital. Strong spin-orbit coupling leads to excitonic antiferromagnetism that can coexist with substantial orbital polarization. We then address the specific example of Ca2RuO4 using ab initio modeling and conclude it to realize excitonic magnetism despite its pronounced orbital polarization.

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