Strong magnetic frustration in Y3Cu9(OH)19Cl8: a distorted kagome antiferromagnet

• DOI: 10.1039/c6tc05110c
• Publication Date: 2017-02-23T17:47:46Z
• Authors: Pascal Puphal; Michael Bolte; Denis Sheptyakov; Andrej Pustogow; Kristin Kliemt; Martin Dressel; Michael Baenitz; Cornelius Krellner
• Keywords: Geometrical frustration

We present the crystal structure and magnetic properties of Y$_{3}$Cu$_{9}$(OH)$_{19}$Cl$_{8}$, a stoichiometric frustrated quantum spin system with slightly distorted kagome layers. Single crystals Y$_{3}$Cu$_{9}$(OH)$_{19}$Cl$_{8}$ were grown under hydrothermal conditions. The was determined from single X-ray diffraction confirmed by neutron powder diffraction. observed reveals two different Cu-positions leading to distored layer in contrast closely related YCu$_{3}$(OH)$_{6}$Cl$_{3}$. Curie-Weiss behavior at high-temperatures Weiss-temperature $\theta_{W}$ order $-100$ K, shows large dominant antiferromagnetic coupling within planes. Specific-heat magnetization measurements on reveal an transition T$_{N}=2.2$ K indicating pronounced frustration parameter $\theta_{W}/T_{N}\approx50$. Optical transmission experiments samples confirm structural findings. YCu$_{3}$(OH)$_{6}$Cl$_{3}$ down 0.4 proposed spin-liquid state that system. Therefore, Y-Cu-OH-Cl compounds unique setting investigate structures strongly AFM ordered state, releasing lattice.