Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 80: Correlated Electrons: Poster

TT 80.32: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster E

Magnetic phase diagram of the frustrated kagome system clinoatacamite — •Aaron Schulze¹, Carolin Kastner¹, Leonie Heinze¹, Dirk Menzel¹, Manfred Reehuis², Ralf Feyerherm², Kirrily Rule³, Anja Wolter⁴, and Stefan Süllow¹ — ¹IPKM, TU Braunschweig, Germany — ²HZB, Berlin, Germany — ³ANSTO, Australia — ⁴IFW, Dresden, Germany

The natural mineral clinoatacamite (Cu₂Cl(OH)₃) has been discussed as geometrically frustrated magnet. The Cu²⁺ ions form a system of kagome layers with an antiferromagnetic in-plane coupling. This type of geometrical frustration leads to exotic quantum states at low temperatures. Here, we present an extensive study using single crystalline material that reveal a complex magnetic phase diagram of the material at low temperatures.

The measurements of the specific heat, magnetic susceptibility and magnetization as well as neutron scattering experiments indicate the existence of several magnetic phases. It is known that the uppermost magnetic phase has an ordering temperature of 18.1 K. The microscopic details of this phase are unknown. The lowest temperature phase exhibits signs of canted antiferromagnetism. Several exotic intermediate phases, whose microscopic behaviour is unclear, exist between these phases. From our data we construct the magnetic phase diagram for magnetic fields parallel and perpendicular to the kagome planes.

Keywords: kagome; frustrated magnet; quantum magnetism; phase diagram; specific heat