Structure and frustrated magnetism of the two-dimensional triangular lattice antiferromagnet Na2BaNi(PO4)2 |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | frustrated magnetism spin liquid triangle lattice |
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