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TT: Fachverband Tiefe Temperaturen

TT 57: Correlated Magnetism – Kagome Systems

TT 57.3: Vortrag

Mittwoch, 11. März 2026, 15:30–15:45, CHE/0091

High-field µSR on the frustrated quantum magnet clinoatacamite Cu₂Cl(OH)₃ — •Carolin Kastner¹, Fabrice Bert², Andrin Doll³, Thomas J. Hicken³, Jonas A. Krieger³, Hubertus Luetkens³, Dirk Menzel¹, F. Jochen Litterst¹, Leonie Stödter⁴, Kirrily C. Rule⁵, Anja U. B. Wolter⁶, and Stefan Süllow¹ — ¹IPKM, TU Braunschweig, Braunschweig, Germany — ²SQM, Université Paris-Saclay, Orsay, France — ³PSI, Villigen, Switzerland — ⁴FZ Jülich, JCNS at MLZ, Garching, Germany — ⁵ANSTO, Lucas Heights, Australia — ⁶Leibniz IFW Dresden, Dresden, Germany

The natural mineral clinoatacamite Cu₂Cl(OH)₃ is a distorted Kagome system with antiferromagnetic in-plane couplings of the order of a few hundred K and ferromagnetic interplane couplings of the order of a few tens of K. This dominance of the antiferromagnetic couplings within the Kagome planes establishes clinoatacamite as a frustrated quantum magnet in its own right. In recent years, we have extensively characterized the complex magnetic phase diagram of clinoatacamite which contains a sequence of magnetic transitions of unknown symmetry. In particular, we have performed a detailed µSR study in zero magnetic field, thus characterizing the different magnetic regions below T_N = 18.1 K using this experimental technique.

To provide further insight into the microscopic details of the different magnetic regions we now have performed a µSR study on single-crystalline clinoatacamite in high magnetic fields up to 6.5 T and will discuss the results in this presentation.

Keywords: frustration; distorted kagome lattice; muSR; natural mineral