Dresden 2020 – wissenschaftliches Programm
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TT 5.8: Vortrag
Montag, 16. März 2020, 11:30–11:45, HSZ 304
Magnetic properties and phase diagram of the triangular-lattice antiferromagnet KCeS2 — •Bastian Rubrecht1,2, Gael Bastien1, Anja U.B. Wolter1, Sven Luther3, Hannes Kühne3, Philipp Schlender4, Ellen Häussler4, Thomas Doert4, and Bernd Büchner1,2 — 1Institute for Solid State and Materials Research, Leibniz IFW Dresden, Germany — 2Institute for Solid State and Materials Physics, TU Dresden, Germany — 3Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — 4Faculty of Chemistry and Food Chemistry, TU Dresden, Germany
Triangular-lattice(TL) antiferromagnets are well-known canditates for frustrated magnetism. By introducing different magnetic rare-earth ions, one can change the magnetic interactions to reinforce frustration in these systems. This may lead to the realization of a quantum spin liquid state or to various competing ordered phases, e.g. an oblique version of the 120∘ state or a collinear up-up-down phase. The delafossite KCeS2 is a new contender realizing anisotropic magnetic interactions. From magnetization measurements of KCeS2-crystals, we observe a strong anisotropy between the basal plane and the c axis. This cannot be explained by g-factor values obtained from single site CASSCF calculations and suggests anisotropic magnetic interactions. Furthermore, our He3 specific heat studies at zero field reveal a phase transition at TN = 0.38 K, which follows a non-monotonous shift as function of an applied in-plane field, resulting in three different magnetic phases in fields up to 9 T. We construct the magnetic phase diagram of KCeS2 and discuss the possible nature of the occurring phases.