Spin frustration and magnetic ordering in triangular lattice antiferromagnet Ca3CoNb2O9
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
a Department of Physics, Renmin University of China, Beijing 100872, China;
b Department of Physics and Astronomy, McMaster University, Hamilton L8S 4M1, Canada;
c Canadian Institute for Advanced Research, Toronto M5G 1Z8, Canada;
d School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
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.
(Saturation moments and magnetic susceptibilities)
Fund:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11374364 and 11222433), the National Basic Research Program of China (Grant No. 2011CBA00112). Research at McMaster University supported by the Natural Sciences and Engineering Research Council. Work at North China Electric Power University supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.
Dai Jia (代佳), Zhou Ping (周萍), Wang Peng-Shuai (王朋帅), Pang Fei (庞斐), Tim J. Munsie, Graeme M. Luke, Zhang Jin-Shan (张金珊), Yu Wei-Qiang (于伟强) Spin frustration and magnetic ordering in triangular lattice antiferromagnet Ca3CoNb2O9 2015 Chin. Phys. B 24 127508
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