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SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 29: Frustrated Magnets: General

TT 29.3: Vortrag

Mittwoch, 29. März 2023, 10:00–10:15, HSZ 201

Weakly coupled triangles forming a star lattice in an organic-inorganic copper sulfate — •Oleg Janson1, Ulrich K. Rößler1, and Hajime Ishikawa21Leibniz IFW Dresden, Germany — 2ISSP, University of Tokyo, Japan

The recently synthesized organic-inorganic copper sulfate [(CH3)2(NH2)]3[Cu3(OH)(SO4)4]·0.24H2O has been proposed as a material realization of the S=1/2 star lattice model [1]. We report high-field magnetization measured on powder samples showing a broad plateau at 1/3 of the saturation magnetization. Full saturation was reached at about 105 T in a destructive pulsed-field experiment. Low-field and low-temperature measurements on single crystals show no indications of magnetic ordering and reveal a sizable anisotropy of magnetization. Density-functional-theory (DFT) calculations indicate the relevance of two inequivalent exchanges JT and JD with JTJD, placing this material in the limit of weakly coupled triangles. Anisotropic components of JT were estimated by noncollinear DFT+U calculations. We demonstrate that a simple model of isolated triangles accounts for the thermodynamic behavior of this compound.
[1] M. Sorolla et al., J. Am. Chem. Soc. 142, 5013 (2020)

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