Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 26: Correlated Magnetism – Frustrated Systems
TT 26.8: Talk
Tuesday, March 10, 2026, 11:30–11:45, HSZ/0103
Magnetic frustration and field-induced transitions in the octahedral lattice iridate Ho3IrO6 — •Abanoub Hanna1, Cintli Aguilar Maldonado1, Ralf Feyerherm1, A.T. M. Nazmul Islam1, and Bella Lake1,2 — 1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner Platz 1, D-14109 Berlin, Germany — 2Institut für Festkörperphysik, Technische Universität Berlin, Germany
Ho3IrO6 is a new octahedral lattice compound in which holmium ions form a distorted network of corner sharing octahedra, providing a clean platform to study frustration in rare earth iridates. X ray and neutron powder diffraction confirm a single phase cubic Ia-3 structure with ordered Ho and Ir sites and no detectable impurities, so the magnetic behaviour can be interpreted without structural complications. Low temperature magnetometry shows a sharp transition near 1 kelvin with strong field dependence, and Curie Weiss analysis indicates antiferromagnetic interactions and a large frustration parameter, pointing to competing exchanges on the octahedral lattice. AC susceptibility, nonlinear magnetization curves and field dependent anomalies reveal a genuine thermodynamic transition and metamagnetic steps, while heat capacity data are consistent with a low lying triplet ground state and an additional Schottky like feature around 5 K.
Keywords: Ho3IrO6; Octochlore lattice; Coloumb spin liquids; Antiferromagnetic interactions; rare earth oxides