中国物理B ›› 2015, Vol. 24 ›› Issue (12): 127508-127508.doi: 10.1088/1674-1056/24/12/127508
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
代佳a, 周萍a, 王朋帅a, 庞斐a, Tim J. Munsieb, Graeme M. Lukeb c, 张金珊d, 于伟强a
Dai Jia (代佳)a, Zhou Ping (周萍)a, Wang Peng-Shuai (王朋帅)a, Pang Fei (庞斐)a, Tim J. Munsieb, Graeme M. Lukeb c, Zhang Jin-Shan (张金珊)d, Yu Wei-Qiang (于伟强)a
摘要:
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.
中图分类号: (Quantized spin models, including quantum spin frustration)