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We report the optical reflectance measurement for Weyl semimetal Mn 3 Sn single crystal at room temperature. We observe a low-loss plasmon in the UV energy ranges. This low plasmonic loss is associated with a large electron scattering rate contributed by electron-electron interaction and scattering of conduction electrons by Mn atoms. The incorporation of more Mn atoms simultaneously adds more elastic scattering centers and increases the strength of electron-electron correlation which generates multiple plasmons with lower plasmonic loss in Mn 3+ x Sn 1- x. The UV tunable plasmonic properties in Mn 3+ x Sn 1- x have great potential for plasmonic and spintronic applications. We also discuss the plasmonic loss in Mn 3 Sn to the other conducting materials including correlated and non-correlated systems establishing the crucial role of electron correlation on the plasmonic loss. Our result suggests novel and effective strategies for obtaining lower plasmonic loss in the class of correlated materials. [ABSTRACT FROM AUTHOR]

Antiferromagnetic polycrystalline Mn 3 Sn thin films with different thicknesses were prepared using DC magnetron sputtering. The magnetic properties, anomalous Hall effect (AHE), and the correlation between them were investigated. X-ray diffraction measurements show that a small amount of ferromagnetic Mn 2 Sn phase coexisted with antiferromagnetic Mn 3 Sn. The films exhibited weak ferromagnetic behavior at room temperature due to the tilt of Mn spin magnetic moment of the antiferromagnetic Mn 3 Sn. The saturation magnetization notably increased below 250 K, corresponding to the Curie temperature of Mn 2 Sn. The Hall resistance curve and magnetic analysis indicate that AHE of antiferromagnetic Mn 3 Sn was completely different from that of a ferromagnetic metal, i.e., AHE resulted from the non-zero Berry curvature of momentum space and the ferromagnetism is not required to AHE. These findings can promote the applications of Mn 3 Sn thin films in the antiferromagnetic spintronic devices. • Polycrystalline Mn3Sn films prepared by DC sputtering exhibited Weyl antiferromagnetic characteristics. • Weak ferromagnetism of Mn3Sn films originated from the tilt of Mn spin magnetic moment. • Anomalous Hall effect of Mn3Sn films resulted from the non-zero Berry curvature of momentum space. [ABSTRACT FROM AUTHOR]