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TT: Fachverband Tiefe Temperaturen
TT 80: Correlated Electrons: Poster
TT 80.23: Poster
Thursday, March 21, 2024, 15:00–18:00, Poster E
Thermodynamic and magnetic characterization of the 3D magnetically frustrated langbeinite material Tl2Mn2(SO4)3 — •Alexander Bäder1, Lucas Berger1, Ladislav Bohaty2, Petra Becker-Bohaty2, Oliver Breunig1, and Thomas Lorenz1 — 1II. Physikalisches Institut, Universität zu Köln — 2Institut für Kristallographie, Universität zu Köln
According to theory, a 3D antiferromagnetic Heisenberg model with strong geometric frustration can be realized on the so-called trillium lattice [1]. Magnetic trillium lattices can be found in cubic materials of the low-symmetry space group P213, which is realized by several members of the langbeinite family, but up to now the magnetic properties of such materials have been hardly explored. In a recent study, signatures of a field-driven quantum spin-liquid behavior have been reported for the langbeinite material K2Ni2(SO4)3 with S=1 Ni2+ ions on a trillium lattice [2]. Here, we report the thermodynamic and magnetic characterization of the analogous Tl2Mn2(SO4)3 langbeinite with S=5/2 Mn2+ ions. From specific heat, magnetocaloric-effect, and magnetization measurements we derive a B–T phase diagram, indicating the presence of at least 3 magnetic phases below a temperature of about 1.5 K. The low ordering temperature in combination with a large field of 15 T to reach magnetic saturation indicates pronounced magnetic frustration.
This work was supported through CRC1238 (projects A02 and B01).
[1] J. Hopkinson, Phys. Rev. B 74, 224441 (2006)
[2] I. Živković et al., Phys Rev. Lett. 127, 157204 (2021)
Keywords: magnetic frustration; spin liquid behavior