Abstract
Co3Sn2S2 is predicted to host topological Weyl semimetal phase in ferromagnetic state. The realization of Weyl phase properties needs tuning of Fermi level which in turn depends on crystalline quality. Here we show that slight variation in high-temperature mixing protocol during crystal growth strongly affects the crystalline quality and resultant physical properties. The detailed crystal characterization reveals that a longer high-temperature mixing protocol yields better crystal quality in comparison to that of intermediate mixing. The crystal grown by long-duration high-temperature mixing (S1) has lower microstrain and low-angle structural grain boundaries due to stress relaxation while the crystal grown by intermediate mixing (S2) has large microstrain and enhanced unit cell volume due to intercalation of sulfur atoms. The transport results indicate ferromagnetic ordering in S1 at 174 K and in S2 at 178 K. Crystal S2 exhibits large positive magnetoresistance and strong thermal suppression of spin disorder in comparison to S1.
Published Version
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