Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Quantum Magnets and Molecular Magnets (joint session TT/MA)

TT 6.7: Vortrag

Montag, 12. März 2018, 11:00–11:15, H 3010

Magnetism of atacamite, Cu₂Cl(OH)₃ — •Leonie Heinze¹, Randirley Beltran-Rodriguez², Gael Bastien², Anja U.B. Wolter², Manfred Reehuis³, Jens-Uwe Hoffmann³, Kirrily C. Rule⁴, and Stefan Süllow¹ — ¹IPKM, TU Braunschweig, Germany — ²IFW Dresden, Dresden, Germany — ³HZB, Berlin, Germany — ⁴ANSTO, Kirrawee, Australia

Atacamite, Cu₂Cl(OH)₃, has been reported to exhibit magnetic behavior characteristic of a frustrated quantum magnet. Notably, an antiferromagnetic transition at T_N = 9.0 K has been observed and, further, susceptibility measurements previously carried out indicate a Curie-Weiss temperature | Θ_CW | ≫ T_N [1,2]. So far, attempts have been undertaken to determine the symmetry of the magnetic ground state of this material by means of µSR and NMR measurements on polycrystalline material [2,3], however with contradictory results.

Starting from this given situation, we have reinvestigated the magnetic properties of atacamite [4]: Mineral single-crystals were studied by means of susceptibility and magnetization measurements along the principal crystal axes as well as elastic neutron scattering. This way, we have established the symmetry of the magnetic ground state and present new insights into the unusual magnetic properties of atacamite.
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