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jeudi 6 décembre à 14h00
Amphi Schutzenberger
Anomalous Transverse Transport in non-collinear antiferromagnets
Mn3X(X=Sn, Ge)]
Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
The ordinary Hall effect, the transverse electric field generated by a longitudinal charge current in the presence of a magnetic field, is caused by the Lorentz force exerted by a magnetic field on charge carriers. In ferromagnetic solids, there is an additional component to this response (known as extraordinary or anomalous) thought to arise as a result of a sizeable magnetization. During the past decade, a clear link between the anomalous Hall effect (AHE) and the Berry curvature of Bloch waves has been established. [1,2]
Recently, following theoretical propositions[3,4], in a family of nonlinear antiferromagnets, Mn3X (X=Sn, Ge), almost with no magnetization, an unexpectedly large AHE has been detected at room temperature and attributed to a nonvanishing Berry [5-7].This observations have opened new venues to study the effects of Berry curvature and their potential applications at room temperature. Several others anomalous transverse responses , Thermoelectric[8,9], Thermal transport[9], and Magneto optic effect[10], had also been reported in this system.
We present, a study of electric, thermoelectric and thermal transport in Mn3X (X=Sn, Ge). The three anomalous transverse conductivities (Hall, Nernst, and Righi-Leduc) were quantified. The thermal and electrical Hall conductivities respect the Wiedemann-Franz law over the whole temperature range of study in Mn3Sn [9]. We also carried out a study of angle-dependent AHE shedding additional light to the origin of anomalous transverse flow and their link to the locus of the Weyl nodes[11].
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