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arXiv · 2110.12153

Magnetic properties of S = 5/2 anisotropic triangular chain Bi3FeMo2O12

K. Boya·K. Nam·A. K. Manna·J. Kang·C. Lyi·A. Jain·S. M. Yusuf·P. Khuntia·B. Sana·V. Kumar·A. V. Mahajan·Deepak. R. Patil·Kee Hoon Kim·S. K. Panda·B. Koteswararao
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Abstract

Competing magnetic interactions in low-dimensional quantum magnets can lead to the exotic ground state with fractionalized excitations. Herein, we present our results on an S = 5/2 quasi-one-dimensional spin system Bi3FeMo2O12. The structure of Bi3FeMo2O12 consists of very well separated, infinite zig-zag S = 5/2 spin chains. The observation of a broad maximum around 10 K in the magnetic susceptibility suggests the presence of short-range spin correlations. Magnetic susceptibility data do not fit to S=5/2 uniform spin chain model due to the presence of 2nd nearest-neighbor coupling (J2) along with the 1st nearest-neighbor coupling J1 of the zig-zag chain. The electronic structure calculations infer that the value of J1 is comparable with J2 (J2/J1~1.1) with a negligible inter-chain interaction (J'/J ~ 0.01), implying that Bi3FeMo2O12 is a highly frustrated triangular chain system. The absence of magnetic long-range ordering down to 0.2 K is seen in the heat capacity data, despite a relatively large antiferromagnetic Curie-Weiss temperature of -40 K. The magnetic heat capacity follows nearly a linear behavior at low temperatures indicating that the S = 5/2 anisotropic triangular chain exhibits the gapless excitations.

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K. Boya, K. Nam, A. K. Manna, J. Kang, C. Lyi, A. Jain, S. M. Yusuf, P. Khuntia, B. Sana, V. Kumar, A. V. Mahajan, Deepak. R. Patil, Kee Hoon Kim, S. K. Panda, B. Koteswararao. 2021-10-23. Magnetic properties of S = 5/2 anisotropic triangular chain Bi3FeMo2O12. https://doi.org/10.1103/physrevb.104.184402

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