Spin frustration and magnetic ordering in triangular lattice antiferromagnet Ca3CoNb2O9
Spin frustration and magnetic ordering in triangular lattice antiferromagnet Ca3CoNb2O9
复制标题
三角晶格反铁磁体 Ca3CoNb2O9 中的自旋挫败和磁排序
DOI：
10.1088/1674-1056/24/12/127508
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发表时间：
2015-12-01
影响因子：
1.7
通讯作者：
Yu Wei-Qiang
中科院分区：
文献类型：
--
作者：
Dai Jia;Zhou Ping;Yu Wei-Qiang
We synthesized a quasi-two-dimensional distorted triangular lattice antiferromagnet Ca3CoNb2O9, in which the effective spin of Co2+ is 1/2 at low temperatures, whose magnetic properties were studied by dc susceptibility and magnetization techniques. The x-ray diffraction confirms the quality of our powder samples. The large Weiss constant θCW∼ −55 K and the low Neel temperature TN∼ 1.45 K give a frustration factor f = | θCW/TN | ≈ 38, suggesting that Ca3CoNb2O9 resides in strong frustration regime. Slightly below TN, deviation between the susceptibility data under zero-field cooling (ZFC) and field cooling (FC) is observed. A new magnetic state with 1/3 of the saturate magnetization Ms is suggested in the magnetization curve at 0.46 K. Our study indicates that Ca3CoNb2O9 is an interesting material to investigate magnetism in triangular lattice antiferromagnets with weak anisotropy.
