Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Frustrated Magnets II

MA 40.8: Talk

Thursday, March 21, 2024, 17:00–17:15, H 1058

Magnetic Phase Diagram of Rouaite, Cu₂(OH)₃NO₃ — •Darren C. Peets¹, Aswathi Mannathanath Chakkingal¹, Anton A. Kulbakov¹, Maxim Avdeev^2,3, Ramender S. Kumar⁴, Issei Niwata⁴, Ellen Häußler⁵, Roman Gumeniuk⁶, J. Ross Stewart⁷, Vladimir Pomjakushin⁸, Sergey Granovsky¹, Yoshihiko Ihara⁴, and Dmytro S. Inosov¹ — ¹Institut für Festkörper- und Materialphysik, TU Dresden, Dresden, Germany — ²ANSTO, Lucas Heights, NSW, Australia — ³University of Sydney, Sydney, NSW, Australia — ⁴Hokkaido University, Sapporo, Japan — ⁵Anorganische Chemie II, TU Dresden, Dresden, Germany — ⁶Institut für Experimentelle Physik, TU Bergakademie Freiberg, Freiberg, Germany — ⁷ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot, UK — ⁸Paul Scherrer Institute, Villigen, Switzerland

Spinon-magnon mixing was recently reported in botallackite Cu₂(OH)₃Br with a uniaxially compressed triangular lattice of Cu²⁺ quantum spins. Its nitrate analogue rouaite, Cu₂(OH)₃(NO₃), has a highly analogous structure and might be expected to exhibit similar physics. To lay a foundation for research on this material, we report rouaite’s magnetic phase diagram and identify both low-field phases. The low-temperature magnetic state comprises alternating ferro- and antiferromagnetic chains as in botallackite, but with some additional canting, while the higher-temperature phase is a helical modulation of this, where the spins rotate from one Cu plane to the next.

Keywords: frustrated magnets; magnetic order; magnetic phase diagram; Cu-based minerals; quantum magnetism