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arXiv · 2502.12433

Disordered ground state in the three-dimensional face-centred frustrated spin-$\frac{5}{2}$ system MnSn(OH)$_\text{6}$

Kaushick K. Parui·Anton A. Kulbakov·Ellen Häußler·Nikolai S. Pavlovskii·Aswathi Mannathanath Chakkingal·Maxim Avdeev·Roman Gumeniuk·Sergey Granovsky·Alexander Mistonov·Sergei A. Zvyagin·Thomas Doert·Dmytro S. Inosov·Darren C. Peets
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Abstract

Frustrated magnetism in face-centred cubic (fcc) magnetic sublattices remains underexplored but holds considerable potential for exotic magnetic behaviour. Here we report on the crystal structure, magnetic and thermodynamic properties of the $A$-site-vacant double hydroxide perovskite MnSn(OH)$_6$. Despite dominant antiferromagnetic interactions among Mn$^{2+}$ moments, evidenced by a negative Curie-Weiss temperature, the lack of a sharp thermodynamic transition down to 350$\,$mK implies the absence of long-range magnetic order. However, a broad hump in the specific heat at 1.6$\,$K suggests short-range correlations. Neutron diffraction at low temperatures confirms the presence of three-dimensional antiferromagnetic correlations, manifested as diffuse magnetic scattering with a correlation length $\xi = 24.66\,${\AA} and magnetic propagation vectors $\mathbf{k}=(\frac{1}{2}\,\frac{1}{2}\,\frac{1}{2})$ and $(0\,0.625\,0)$ at 20$\,$mK.

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Kaushick K. Parui, Anton A. Kulbakov, Ellen Häußler, Nikolai S. Pavlovskii, Aswathi Mannathanath Chakkingal, Maxim Avdeev, Roman Gumeniuk, Sergey Granovsky, Alexander Mistonov, Sergei A. Zvyagin, Thomas Doert, Dmytro S. Inosov, Darren C. Peets. 2025-02-18. Disordered ground state in the three-dimensional face-centred frustrated spin-$\frac{5}{2}$ system MnSn(OH)$_\text{6}$. https://doi.org/10.1103/dmvp-xj68

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