Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 77: Frustrated Magnets: Strong Spin-Orbit Coupling II
TT 77.3: Vortrag
Donnerstag, 21. März 2024, 15:30–15:45, H 3025
Pressure- and temperature-induced structural evolution of RuBr3 with honeycomb layers — •Victoria A. Ginga1, Bin Shen2, Prashanta K. Mukharjee2, Angel M. Arevalo-Lopez3, Ece Uykur4, Philipp Gegenwart2, and Alexander A. Tsirlin1,2 — 1Felix Bloch Institute, University of Leipzig, Germany — 2EP VI, EKM, University of Augsburg, Germany — 3University of Lille, France — 4Helmholtz-Zentrum Dresden-Rossendorf, Germany
RuBr3 received recent attention as a close chemical analog of the Kitaev magnet α-RuCl3. Here, we report on the structural transformations of RuBr3 and the stability ranges of its different polymorphs as a function of pressure and temperature. At ambient pressure, β-RuBr3 forms a chain-like structure where short Ru-Ru bonds prevent the Ru3+ ions from being magnetic. In turn, β-RuBr3 can be transformed into layered BiI3-type magnetic α-RuBr3 (space group R-3) by a high-pressure high-temperature treatment and quenched to ambient conditions. We show that α-RuBr3 is metastable and irreversibly transforms into β-RuBr3 on heating. Additionally, there is a reversible R-3 to C2/m transformation before β-RuBr3 is reached. Upon compression, α-RuBr3 shows a strong tendency toward Ru-Ru dimerization in the triclinic and nonmagnetic α*-RuBr3 (space group P-1).
Keywords: Kitaev magnets; structural evolution; polymorphic modifications of RuBr3; magnetic frustration; Van der Waals magnets