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Here we report successful synthesis of single crystalline magnetic Weylsemimetal Co3Sn2S2. The synthesized crystal is characterized through varioustools viz. X-ray diffraction, field emission electron microscopy and X-rayphotoelectron spectroscopy. A clear ferromagnetic transition is observed inmagnetization and heat capacity at around 175K, which is further verifiedthrough electrical transport measurements. Hysteresis is observed in R-Tmeasurements in cooling and warming cycle, showing the presence of first orderphase transition and charge ordering in the synthesized sample. The synthesizedCo3Sn2S2 exhibits high magnetoresistance of around 230% at 2K. The transportphenomenon in synthesized Co3Sn2S2 appears to have contributions fromtopological surface states at low temperature below say 70 K, and above thatthe same is found to be strongly dependent on its bulk magnetic state.Magnetoconductivity data at low fields of up to plus minus 1T (Tesla) is fittedwith Hikami Larkin Nagaoka model, which shows the presence of weakantilocalization effect in synthesized Co3Sn2S2 crystal at low temperaturesbelow 30K.

Weak antilocalization and ferromagnetism in magnetic Weyl semimetal Co3Sn2S2