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TT: Fachverband Tiefe Temperaturen

TT 57: Correlated Magnetism – Kagome Systems

TT 57.2: Vortrag

Mittwoch, 11. März 2026, 15:15–15:30, CHE/0091

Competing ordering modes in the distorted quantum Kagome material clinoatacamite Cu₂Cl(OH)₃ — •Leonie Stödter^1,2, Carolin Kastner¹, Harald O. Jeschke³, Manfred Reehuis⁴, Ketty Beauvois⁵, Bachir Ouladdiaf⁵, Edmond Chan⁵, Fabiano Yokaichiya⁴, Fabrice Bert⁶, Thomas J. Hicken⁷, Jonas A. Krieger⁷, Hubertus Luetkens⁷, Jackson L. Allen⁸, Ralf Feyerherm⁴, Michael Tovar⁴, Dirk Menzel¹, Anja U. B. Wolter⁹, Kirrily C. Rule¹⁰, F. Jochen Litterst¹, Ulrich K. Rößler⁹, and Stefan Süllow¹ — ¹IPKM, TU Braunschweig, Braunschweig, Germany — ²FZ Jülich, JCNS at MLZ, Garching, Germany — ³RIIS, Okayama University, Okayama, Japan — ⁴HZB, Berlin, Germany — ⁵ILL, Grenoble, France — ⁶SQM, Université Paris-Saclay, Orsay, France — ⁷PSI, Villigen, Switzerland — ⁸ISEM, University of Wollongong, Australia — ⁹Leibniz IFW Dresden, Dresden, Germany — ¹⁰ANSTO, Lucas Heights, Australia

Structurally, the mineral clinoatacamite Cu₂Cl(OH)₃ is closely related to the Kagome material herbertsmithite ZnCu₃Cl₂(OH)₆, however, its Kagome motif of Cu sites is embedded into a low-symmetry crystal structure. The magnetic ground states of clinoatacamite below an ordering temperature of 18.1 K have remained inconclusive to date. Here, we revisit the magnetic properties using single-crystalline material. We have characterized clinoatacamite by means of thermodynamic measurement techniques, µSR as well as neutron diffraction. We reveal a complex zero-field sequence of phases and discuss our data within a scenario of competing antiferromagnetic ordering modes.

Keywords: frustration; distorted kagome lattice; mineral