中国物理B ›› 2021, Vol. 30 ›› Issue (11): 117505-117505.doi: 10.1088/1674-1056/abff1d

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Structure and frustrated magnetism of the two-dimensional triangular lattice antiferromagnet Na2BaNi(PO4)2

Fei Ding(丁飞)1, Yongxiang Ma(马雍翔)1, Xiangnan Gong(公祥南)2, Die Hu(胡蝶)3, Jun Zhao(赵俊)3, Lingli Li(李玲丽)4, Hui Zheng(郑慧)4, Yao Zhang(张耀)4, Yongjiang Yu(于永江)1, Lichun Zhang(张立春)1, Fengzhou Zhao(赵风周)1, and Bingying Pan(泮丙营)1,†   

  1. 1 School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, China;
    2 Analytical and Testing Center, Chongqing University, Chongqing 401331, China;
    3 State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University, Shanghai 200433, China;
    4 School of Chemistry and Materials Science, Ludong University, Yantai 264025, China
  • 收稿日期:2021-01-24 修回日期:2021-04-15 接受日期:2021-05-08 出版日期:2021-10-13 发布日期:2021-10-22
  • 通讯作者: Bingying Pan E-mail:bypan@ldu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11804137) and the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2020YQ03 and ZR2018BA026).

Structure and frustrated magnetism of the two-dimensional triangular lattice antiferromagnet Na2BaNi(PO4)2

Fei Ding(丁飞)1, Yongxiang Ma(马雍翔)1, Xiangnan Gong(公祥南)2, Die Hu(胡蝶)3, Jun Zhao(赵俊)3, Lingli Li(李玲丽)4, Hui Zheng(郑慧)4, Yao Zhang(张耀)4, Yongjiang Yu(于永江)1, Lichun Zhang(张立春)1, Fengzhou Zhao(赵风周)1, and Bingying Pan(泮丙营)1,†   

  1. 1 School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, China;
    2 Analytical and Testing Center, Chongqing University, Chongqing 401331, China;
    3 State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University, Shanghai 200433, China;
    4 School of Chemistry and Materials Science, Ludong University, Yantai 264025, China
  • Received:2021-01-24 Revised:2021-04-15 Accepted:2021-05-08 Online:2021-10-13 Published:2021-10-22
  • Contact: Bingying Pan E-mail:bypan@ldu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11804137) and the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2020YQ03 and ZR2018BA026).

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摘要： A new frustrated triangular lattice antiferromagnet Na2BaNi(PO4)2 was synthesized by high temperature flux method. The two-dimensional triangular lattice is formed by the Ni2+ ions with S =1. Its magnetism is highly anisotropic with the Weiss constants θCW =-6.615 K (H⊥c) and -43.979 K (H||c). However, no magnetic ordering is present down to 0.3 K, reflecting strong geometric spin frustration. Our heat capacity measurements show substantial residual magnetic entropy existing below 0.3 K at zero field, implying the presence of low energy spin excitations. These results indicate that Na2BaNi(PO4)2 is a potential spin liquid candidate with spin-1.

关键词: frustrated magnetism, spin liquid, triangle lattice

Abstract: A new frustrated triangular lattice antiferromagnet Na2BaNi(PO4)2 was synthesized by high temperature flux method. The two-dimensional triangular lattice is formed by the Ni2+ ions with S =1. Its magnetism is highly anisotropic with the Weiss constants θCW =-6.615 K (H⊥c) and -43.979 K (H||c). However, no magnetic ordering is present down to 0.3 K, reflecting strong geometric spin frustration. Our heat capacity measurements show substantial residual magnetic entropy existing below 0.3 K at zero field, implying the presence of low energy spin excitations. These results indicate that Na2BaNi(PO4)2 is a potential spin liquid candidate with spin-1.

Key words: frustrated magnetism, spin liquid, triangle lattice

中图分类号:  (Quantum spin liquids, valence bond phases and related phenomena)

  • 75.10.Kt
75.50.Ee (Antiferromagnetics) 75.10.Jm (Quantized spin models, including quantum spin frustration)