Spin frustration and magnetic ordering in triangular lattice antiferromagnet Ca3CoNb2O9

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

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

Spin frustration and magnetic ordering in triangular lattice antiferromagnet Ca₃CoNb₂O₉

代佳^a, 周萍^a, 王朋帅^a, 庞斐^a, Tim J. Munsie^b, Graeme M. Luke^{b c}, 张金珊^d, 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

收稿日期:2015-09-25 修回日期:2015-10-16 出版日期:2015-12-05 发布日期:2015-12-05
通讯作者: Yu Wei-Qiang E-mail:wqyu_phy@ruc.edu.cn
基金资助:
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.

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. Munsie^b, Graeme M. Luke^{b 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

Received:2015-09-25 Revised:2015-10-16 Online:2015-12-05 Published:2015-12-05
Contact: Yu Wei-Qiang E-mail:wqyu_phy@ruc.edu.cn
Supported by:
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.

摘要/Abstract

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 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.

关键词: Ca₃CoNb₂O₉, triangular lattice, frustration, spin glass, magnetization plateau

Abstract:

Key words: Ca₃CoNb₂O₉, triangular lattice, frustration, spin glass, magnetization plateau

中图分类号: (Quantized spin models, including quantum spin frustration)

75.10.Jm

75.30.-m (Intrinsic properties of magnetically ordered materials) 75.30.Cr (Saturation moments and magnetic susceptibilities)

代佳, 周萍, 王朋帅, 庞斐, Tim J. Munsie, Graeme M. Luke, 张金珊, 于伟强. Spin frustration and magnetic ordering in triangular lattice antiferromagnet Ca₃CoNb₂O₉[J]. 中国物理B, 2015, 24(12): 127508-127508.

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[J]. Chin. Phys. B, 2015, 24(12): 127508-127508.

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Spin frustration and magnetic ordering in triangular lattice antiferromagnet Ca₃CoNb₂O₉

Spin frustration and magnetic ordering in triangular lattice antiferromagnet Ca₃CoNb₂O₉

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