Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Poster I

MA 15.27: Poster

Tuesday, March 18, 2025, 10:00–12:30, P1

Quantum spin liquid mimicry in correlated proton disorder double hydroxide perovskite CuSn(OD)₆ — •Anton Kulbakov¹, Ellen Haeussler², Aswathi Mannathanath Chakkingal¹, Nikolai Pavlovskii¹, Kaushick Parui¹, Sergey Granovsky¹, Sebastian Gass³, Laura Teresa Corredor Bohorquez³, Anja Wolter^3,4, Vladimir Pomjakushin⁵, Darren Peets¹, Thomas Doert², and Dmytro Inosov^1,4 — ¹IFMP, TUD, Dresden, Germany — ²Faekultaet fuer Chemie und Lebensmittelchemie, TUD, Dresden,Germany — ³IFW, Dresden, Germany — ⁴Wuerzburg-Dresden ct.qmat, TUD, Dresden, Germany — ⁵PSI, Villigen, Switzerland

In a magnetic double perovskite hydroxide CuSn(OD)₆, the frustration of the proton network coexists with magnetic frustration on the distorted fcc sublattice. Structural distortions, which are most pronounced in the Cu²⁺ compounds due to the Jahn-Teller effect, partially alleviate both frustrations. On the other hand, the quantum spin S=1/2 promotes quantum fluctuations that lower the ordering temperature. Proton disorder is also expected to suppress long-range order tendencies from most general considerations, as it should lead to variations in the exchange constants, which can effectively be described as bond disorder in the spin model. In certain scenarios, these can destroy long-range order in favor of spin-liquid-mimicry.

Keywords: spin-liquid-mimicry; correlated proton disorder; quantum spin; double perovskite hydroxide; magnetism