Experimental Realization of Spin-1/2 Triangular-Lattice Heisenberg Antiferromagnet

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.

5 pages, 5 figures

References in corpus (6)

• Magnetization plateaus in frustrated antiferromagnetic quantum spin models
• Excitation spectra of the spin-1/2 triangular-lattice Heisenberg antiferromagnet
• Quantum stabilization of 1/3-magnetization plateau in Cs_2CuBr_4
• Critical magnetization behaviors of the triangular and Kagome lattice quantum antiferromagnets
• Flat spin wave dispersion in a triangular antiferromagnet
• Quantum Magnetization Plateau in Spin-1 Triangular-Lattice Antiferromagnet Ba${}_3$NiSb${}_2$O${}_9$

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