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Competing magnetic interactions in low-dimensional quantum magnets can leadto the exotic ground state with fractionalized excitations. Herein, we presentour results on an S = 5/2 quasi-one-dimensional spin system Bi3FeMo2O12. Thestructure 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 magneticsusceptibility suggests the presence of short-range spin correlations. Magneticsusceptibility data do not fit to S=5/2 uniform spin chain model due to thepresence of 2nd nearest-neighbor coupling (J2) along with the 1stnearest-neighbor coupling J1 of the zig-zag chain. The electronic structurecalculations infer that the value of J1 is comparable with J2 (J2/J1~1.1) witha negligible inter-chain interaction (J'/J ~ 0.01), implying that Bi3FeMo2O12is a highly frustrated triangular chain system. The absence of magneticlong-range ordering down to 0.2 K is seen in the heat capacity data, despite arelatively large antiferromagnetic Curie-Weiss temperature of -40 K. Themagnetic heat capacity follows nearly a linear behavior at low temperaturesindicating that the S = 5/2 anisotropic triangular chain exhibits the gaplessexcitations.

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