Magnetic Phase Diagram of the S=1/2 Triangular-Lattice Heisenberg Antiferromagnet Ba3CoNb2O9

Abstract

We report the results of low-temperature thermal and magnetic measurements on Ba${}_3$CoNb${}_2$O${}_9$ powder, described as a uniform triangular-lattice antiferromagnet (TLAF) with a fictitious spin-1/2. Ba${}_3$CoNb${}_2$O${}_9$ is found to undergo two-step antiferromagnetic transitions at $T_{N1}=1.39\mathrm{K}$ and $T_{N2}=1.13\mathrm{K}$. As the magnetic field is increased, both $T_{N1}$ and $T_{N2}$ monotonically decrease. The magnetic field vs temperature phase diagram indicates that the exchange interactions are nearly of the Heisenberg type with weak easy-axis anisotropy and that the exchange interaction between triangular lattices is crucial, in contrast to the case of the quasi-two-dimensional TLAF Ba${}_3$CoSb${}_2$O${}_9$ [Susuki {\it et al}., Phys. Rev. Lett. \textbf{110}, 267201 (2013)].

arXiv comment14 pages, 6 Figures, to appear in Phys. Rev. B

References in corpus (8)

• Universality of phase transitions of frustrated antiferromagnets
• Experimental Realization of Spin-1/2 Triangular-Lattice Heisenberg Antiferromagnet
• Magnetization Process and Collective Excitations in the S=1/2 Triangular-Lattice Heisenberg Antiferromagnet Ba3CoSb2O9
• Cascade of magnetic-field-induced quantum phase transitions in a spin $1/2$ triangular-lattice antiferromagnet
• Critical magnetization behaviors of the triangular and Kagome lattice quantum antiferromagnets
• A Comparative Study of the Magnetization Process of Two-Dimensional Antiferromagnets
• High-Order Coupled Cluster Method Study of Frustrated and Unfrustrated Quantum Magnets in External Magnetic Fields
• Successive phase transitions and phase diagrams of the quasi-two-dimensional triangular antiferromagnet Rb4Mn(MoO4)3

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