Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 47: Frustrated Magnets - Iridates and Fe-based Materials
TT 47.8: Talk
Wednesday, March 14, 2018, 11:30–11:45, H 0104
Low temperature heat capacity measurements on the mixed-valence iridate Ba3InIr2O9 — •Sebastian Bachus, Yoshifumi Tokiwa, Tusharkanti Dey, Mayukh Majumder, Alexander Tsirlin, and Philipp Gegenwart — Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, Germany
Frustrated magnetism can give rise to new exotic states. A prominent example are quantum spin liquids (QSL) which show no ordering of their magnetic moments even at zero temperature. Promising candidates for a QSL ground state are materials with highly frustrated magnetic moments e.g. on a kagomé or triangular lattice.
Recently the family of mixed-valence iridates has been proposed as an alternative material class for the search of QSL. One example is Ba3InIr2O9, where mixed-valence Ir2O9 dimers with Ir4.5+ are formed, sharing one unpaired electron per dimer [1]. Here, we report low temperature measurements of heat capacity. Our data show no long-range ordering as well as continuos excitations down to at least 80 mK, which strongly indicates a gapless QSL ground state. This work has been funded by the German Science Foundation through TRR 80.
[1] T. Dey et al., Phys. Rev. B 96, 174411 (2017).