Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 41: Frustrated Magnets - Spin Liquids - Experiments
TT 41.2: Vortrag
Dienstag, 13. März 2018, 10:30–10:45, H 3005
Low temperature properties of the triangular antiferromagnet KBaYb(BO3)2 — •K. Kavita, S. Bachus, Y. Tokiwa, A. A. Tsirlin, and P. Gegenwart — Experimental Physics VI, University of Augsburg, Germany
Geometrically frustrated magnetic materials host new exotic states such as quantum spin liquids (QSL). A recent example is the QSL candidate YbMgGaO4, with the triangular lattice of pseudospin-1/2 Yb3+ ions. A crucial part, to understand the physics of YbMgGaO4, is to identify leading interaction terms that may extend beyond nearest neighbors. To this end, we studied KBaYb(BO3)2, where the Yb3+ ions are also arranged on a triangular lattice, whereas the distance between nearest neighbors is comparable to the next nearest neighbor distance in YbMgGaO4. Our polycrystalline samples confirm the rhombohedral symmetry of KBaYb(BO3)2 with the space group R3m. Magnetic susceptibility data down to 1.8 K revealed a Curie-Weiss temperature of about 20 mK with antiferromagnetic couplings. Furthermore, we report heat capacity down to 60 mK, which also indicates a very small exchange coupling.