Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.11: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Thermodynamics of the Kagome lattice with arbitrary spin S≥1/2 — •Patrick Müller, Andreas Zander, and Johannes Richter — Institut für Theoretische Physik, Universität Magdeburg - 39016 Magdeburg, Germany
One of the most prominent and at the same time frequently discussed model with a frustration induced highly degenerated classical ground-state (GS) manifold is the Heisenberg antiferromagnet (HAFM) on the Kagome lattice. The geometry of the lattice, which consists of corner-sharing triangles, suppresses a conventional ordering of the spins at absolute zero. Although it is clear that for S=1/2 there is no magnetic long-range order, the precise nature of the quantum spin-liquid is still under debate. We use the spin-rotation invariant Green’s function method (RGM) with an additional input (ground-state energy data of the Coupled-Cluster-Method (CCM)[1]) to study the temperature dependence of the magnetic structure factor SQ, the susceptiblity χ0, the specific heat CV, the correlation length ξQ and the correlation functions ⟨ S0SR⟩ for S≥1/2. Moreover, we compare the RGM data with the corresponding high-temperature expansion (HTE) data [2]. [1] O. Götze, D. J. J. Farnell, R. F. Bishop, P. H. Y. Li, and J. Richter, Phys. Rev. B 84, 224428, (2011). [2] A. Lohmann, H.-J. Schmidt, and J. Richter, Phys. Rev. B 89, 014415, (2014). [3] B. H. Bernhard, B. Canals, and C. Lacroix, Phys. Rev. B 66, 104424, (2002). [4] D. Schmalfuss, J. Richter, and D. Ihle, Phys. Rev. B 70, 184412, (2004).