Magnetic phase diagram in three-dimensional triangular-lattice antiferromagnet Sr${}_3$CoTa${}_2$O${}_9$ with small easy-axis anisotropy

Abstract

We report the results of low-temperature magnetization and specific heat measurements of Sr${}_3$CoTa${}_2$O${}_9$ powder, in which Co${}^{2+}$ ions with effective spin-1/2 form a uniform triangular lattice in the $ab$ plane. It was found that Sr${}_3$CoTa${}_2$O${}_9$ undergoes successive antiferromagnetic transitions at $T_{N1}=0.97\mathrm{K}$ and $T_{N2}=0.79\mathrm{K}$ at zero magnetic field. As the magnetic field increases, both $T_{N1}$ and $T_{N2}$ decrease monotonically. The obtained magnetic field vs temperature phase diagram together with a sharp magnetization anomaly at a saturation field of ${\mu }_0{H}_{\mathrm{s}}=2.3\mathrm{T}$ indicates that Sr${}_3$CoTa${}_2$O${}_9$ is described as a spin-1/2 three-dimensional triangular-lattice antiferromagnet with a weak easy-axis anisotropy. We discuss the characteristics of the magnetic phase diagram, which approximates the phase diagram for the magnetic field perpendicular to the $c$ axis.

arXiv comment12 pages, 11 figures, accepted for publication in Phys. Rev. B

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