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MA: Fachverband Magnetismus

MA 19: Frustrated Magnets I (joint session MA/TT)

MA 19.6: Vortrag

Dienstag, 10. März 2026, 10:45–11:00, POT/0361

Dimensional reduction and fractionalized magnetization plateaus in the scalene-distorted triangular-lattice magnet kobyashevite — •Kaushick Parui¹, Anton Kulbakov¹, Roman Gumeniuk², Maria Teresa Fernandez-Diaz³, Sergey Granovsky¹, Sergei Zvyagin⁴, Dmytro Inosov¹, and Darren Peets^1,5 — ¹TU Dresden, Germany — ²TU Bergakademie Freiberg, Germany — ³ILL, France — ⁴HZDR, Germany — ⁵ct.qmat, TU Dresden, Germany

Quantum magnetism intertwined with lattice distortion can give rise to exotic ground states, yet studies on scalene-distorted triangular-lattice antiferromagnets remain scarce. Here, we report the crystal and magnetic structures, as well as magnetic and thermodynamic properties, of kobyashevite, Cu₅(SO₄)₂(OH)₆·4H₂O. This compound hosts a scalene-distorted triangular lattice and exhibits antiferromagnetic order at 4 K, with a possible second transition at 0.64 K. High-field magnetization and specific-heat measurements reveal a cascade of field-induced states, manifested as magnetization plateaus, suggestive of a rich magnetic phase diagram. Neutron diffraction uncovers a dimensionally-reduced commensurate magnetic structure with propagation vector k = (0 0 1/2), consisting of coupled alternating ferromagnetic and antiferromagnetic spin chains, while the Cu4 spins remain idle at 1.5 K. Collectively, these results establish kobyashevite as a promising platform for exploring the interplay of frustration, distortion, and dimensional reduction in quantum magnets.

Keywords: Frustrated Magnetism; Neutron diffraction; Specific heat; Antiferromagnetism; Minerals