Two-Step Antiferromagnetic Transitions and Ferroelectricity in Spin-1 Triangular-Lattice Antiferromagnetic Sr3NiTa2O9
M Liu, H Zhang, X Huang, C Ma, S Dong… - Inorganic …, 2016 - ACS Publications
We report the low-temperature characterizations on structural, specific heat, magnetic, and
ferroelectric behaviors of transition metal oxide compound Sr3NiTa2O9. It is suggested that
Sr3NiTa2O9 is a spin-1 triangular lattice Heisenberg quantum antiferromagnet which may
have weak easy-axis anisotropy. At zero magnetic field, a two-step transition sequence at T
N1= 3.35 K and T N2= 2.74 K, respectively, is observed, corresponding to the up–up–down
(uud) spin ordering and 120° spin ordering, respectively. The two transition points shift …
ferroelectric behaviors of transition metal oxide compound Sr3NiTa2O9. It is suggested that
Sr3NiTa2O9 is a spin-1 triangular lattice Heisenberg quantum antiferromagnet which may
have weak easy-axis anisotropy. At zero magnetic field, a two-step transition sequence at T
N1= 3.35 K and T N2= 2.74 K, respectively, is observed, corresponding to the up–up–down
(uud) spin ordering and 120° spin ordering, respectively. The two transition points shift …
We report the low-temperature characterizations on structural, specific heat, magnetic, and ferroelectric behaviors of transition metal oxide compound Sr3NiTa2O9. It is suggested that Sr3NiTa2O9 is a spin-1 triangular lattice Heisenberg quantum antiferromagnet which may have weak easy-axis anisotropy. At zero magnetic field, a two-step transition sequence at TN1 = 3.35 K and TN2 = 2.74 K, respectively, is observed, corresponding to the up–up–down (uud) spin ordering and 120° spin ordering, respectively. The two transition points shift gradually with increasing magnetic field toward the low temperature, accompanying an evolution from the 120° spin structure (phase) to the normal oblique phases. Ferroelectricity in the 120° phase is clearly identified. The first-principles calculations confirm the 120° phase as the ground state whose ferroelectricity originates mainly from the electronic polarization.
ACS Publications
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