Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 37: Correlated Electrons: Poster
TT 37.22: Poster
Wednesday, March 19, 2025, 15:00–18:00, P4
Magnetic Phase Diagrams of the Frustrated Langbeinite Material Tl2Mn2(SO4)3 — •Manuel Tönnißen1, Alexander Bäder1, Ladislav Bohatý2, Petra Becker-Bohatý2, Oliver Breunig1, and Thomas Lorenz1 — 1II. Physikalisches Institut, Universität zu Köln — 2Institut für Kristallographie, Universität zu Köln
Antiferromagnetic Heisenberg spins on the so-called trillium lattice form a highly frustrated 3-dimensional spin system [1]. This theoretical model can be realizied in cubic, low-symmetry space group P213 materials. One family of materials that partially crystallizes in this space group are langbeinites. Recent studies report that the langbeinite K2Ni2(SO4)3 with S=1 Ni2+ ions show close proximity to a field-driven quantum spin-liquid behavior, although there is magnetic order in zero field [2] [3]. Here we focus on the different magnetic phases of the related langbeinite Tl2Mn2(SO4)3 with S=5/2 Mn2+ ions. By conducting specific-heat, magnetocaloric-effect, and magnetization measurements, we derive B-T phase diagrams for different orientations of the magnetic field. Our data reveal the presence of at least 3 magnetic phases below a temperature of about 1.5 K for the magnetic field along the [1 1 1] direction and even 4 magnetic phases for fields applied along the [1 1 0] or [0 0 1] directions.
This work is supported through CRC1238 (projects A02 and B01).
[1] J. Hopkinson, Phys. Rev. B, 74, 224441 (2006);
[2] M. G. Gonzalez et al., Nat. Commun. 15, 7191 (2024);
[3] I. Živković et al., Phys Rev. Lett. 127, 157204 (2021).
Keywords: magnetic frustration; spin liquid behavior; B-T Phase diagrams