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Experimental Realization of Spin-1/2 Triangular-Lattice Heisenberg Antiferromagnet (1110.3889v1)

Published 18 Oct 2011 in cond-mat.str-el

Abstract: We report the results of magnetization and specific heat measurements on Ba$_3$CoSb$_2$O$_9$, in which the magnetic Co${2+}$ ion has a fictitious spin-1/2, and show evidence that a spin-1/2 Heisenberg antiferromagnet on a regular triangular lattice is actually realized in Ba$_3$CoSb$_2$O$_9$. We found that the entire magnetization curve including the one-third quantum magnetization plateau is in excellent agreement with theoretical calculations at a quantitative level.

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