Spin frustration and magnetic ordering in triangular lattice antiferromagnet Ca3CoNb2O9

doi:10.1088/1674-1056/24/12/127508

Abstract

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 θ_CW～-55 K and the low Neel temperature T_N～ 1.45 K give a frustration factor f=|θ_CW/T_N|≈ 38, suggesting that Ca₃CoNb₂O₉ resides in strong frustration regime. Slightly below T_N, 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 M_s 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.

Keywords: Ca₃CoNb₂O₉ triangular lattice frustration spin glass magnetization plateau

Received: 25 September 2015
Revised: 16 October 2015
Accepted manuscript online:

PACS:	75.10.Jm	(Quantized spin models, including quantum spin frustration)
	75.30.-m	(Intrinsic properties of magnetically ordered materials)
	75.30.Cr	(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.

Corresponding Authors: Yu Wei-Qiang
E-mail: wqyu_phy@ruc.edu.cn

Cite this article:

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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Spin frustration and magnetic ordering in triangular lattice antiferromagnet Ca3CoNb2O9

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Spin frustration and magnetic ordering in triangular lattice antiferromagnet Ca₃CoNb₂O₉