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Co3Sn2S2 has generated a growing interest as a rare example of the highlyuniaxial anisotropic kagome ferromagnet showing a combination offrustrated-lattice magnetism and topology. Recently, via precise measurementsof the magnetization and AC susceptibility we have found a low-field anomalousmagnetic phase (A-phase) with very slow spin dynamics that appears just belowthe Curie temperature (T_C). The A-phase hosts high-density domain bubblesafter cooling through T_C as revealed in a previous in-situ Lorentz-TEM study.Here, we present further signatures of the anomalous magnetic transition (MT)at T_C revealed by a study of the critical behaviors of the magnetization andmagnetocaloric effect using a high-quality single crystal. Analyses of numerousmagnetization isotherms around T_C (177 K) using different approaches (themodified Arrot plot, Kouvel-Fisher method and magnetocaloric effect) result inconsistent critical exponents that do not satisfy the theoretical predictionsof standard second-order-MT models. Scaling analyses for the magnetization,magnetic entropy change and field-exponent of the magnetic entropy change, allconsistently show low-field deviations below TC from the universal curves. Ourresults reveal that the MT of Co3Sn2S2 can not be explained as a conventionalsecond-order type and suggest an anomalous magnetic state below T_C.

Unconventional critical behaviors at the magnetic phase transition of Co3Sn2S2 kagome ferromagnet