Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Poster Session: Correlated Electrons 2
TT 50.10: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Kagome quantum spin systems in the atacamite family — Pascal Puphal1, •Katharina M. Zoch1, Joy Désor1, Michael Bolte2, and Cornelius Krellner1 — 1Physikalisches Institut, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany — 2Institut für Organische Chemie der Universität Frankfurt, 60439 Frankfurt am Main, Germany
The atacamite family of compounds presents a rich field of
different substitution possibilities based on the three basic polymorphs of Cu2(OH)3Cl: atacamite, clinoatacamite and botallackite, allowing substitutions both on the Cu and Cl place. We present the hydrothermal synthesis, as well as structural and chemical analysis, of single crystals of EuCu3(OH)6Cl3, ZnxCu4−x(OH)6(NO3)2 and haydeeite, and MgCu3(OH)6Cl2 compounds, all arising from the atacamite family [1]. Magnetic and specific-heat measurements down to 1.8 K are carried out for these systems. EuCu3(OH)6Cl3 has a frustrated antiferromagnetic Cu2+ ground state with order at 15 K, and a strong anisotropy and increased magnetization from Van Vleck paramagnetic Eu3+ contributions. ZnCu3(OH)6(NO3)2 reveals antiferromagnetic order at 9 K and measurements on haydeeite single crystals confirm the ferromagnetic order at
4.2 K with the easy axis within the kagome plane.
P. Puphal et. al., Phys. Rev. Materials 2, 063402