Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 24: Frustrated Magnets - Spin Liquids 1 (joint session TT/MA)

TT 24.13: Vortrag

Dienstag, 17. März 2020, 12:45–13:00, HSZ 304

Chromium breathing pyrochlores as a showcase for a variety of pyrochlore Hamiltonians — •Tobias Müller1, Pratyay Ghosh2, Yasir Iqbal3, Ronny Thomale1, Johannes Reuther4, Michel J. P. Gingras5,6, and Harald O. Jeschke71Institute for Theoretical Physics and Astrophysics, Julius-Maximilians University of Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Paul Scherrer Institut, Forschungsstrasse 111, 5232 Villigen PSI, Schweiz Switzerland — 3Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India — 4Dahlem Center for Complex Quantum Systems and Fachbereich Physik,Freie Universität Berlin, 14195 Berlin, Germa — 5epartment of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada — 6Quantum Materials Program, Canadian Institute for Advanced Research, MaRS Centre,West Tower 661 University Ave., Suite 505, Toronto, ON, M5G 1M1, Cana — 7Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japa

We investigate all six structurally characterized chromium-based breathing pyrochlores using a combination of density functional theory and pseudofermion functional renormalization group calculations. We show that the variety of chemical compositions leads to distinct magnetic behavior due to the different pyrochlore Hamiltonians realized. We discuss especially the line-like degeneracies in momentum space found in sulfide compounds and an approximate spiral spin liquid in a selenide material. The root cause for these effects are longer-rage exchange couplings up to third nearest neighbor type.

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