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We investigated magnetic and electric properties of two triangular lattice antiferromagnets (TLAFs), Ba3ATa2O9 (A=Ni and Co). Ba3NiTa2O9 shows (i) a single antiferromagnetic phase transition to 120 degree ordered state at TN∼3.3K, (ii) a weak spin-flop-like transition in isothermal magnetization curves around 4T, and the saturation magnetization about 1.6μB per Ni2+ above 9.2T, and (iii) a weak magnetoelectric...
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