Fig. 5: Magneto-transport properties of FVAB50 composite. | Nature Communications

Fig. 5: Magneto-transport properties of FVAB50 composite.

From: Decoupled charge and heat transport in Fe2VAl composite thermoelectrics with topological-insulating grain boundary networks

Fig. 5

a Field-dependent Hall resistivity of FVAB50 at different temperatures 4 ≤ T ≤ 400 K. Room-temperature data of Fe2V0.95Ta0.1Al0.95 are shown for comparison as black open circles. b Two-channel transport modeling of field-dependent Hall resistivity. Solid lines are least squares fits. Inset shows a sketch of the Hall effect in FVABX composites. Highly mobile Dirac-like carriers along the Bi-Sb GB network have a much larger mean free path than the Heusler bulk electrons and are deflected much easier, even in small magnetic fields. c Temperature-dependent Hall mobility of FVAB50 obtained by modeling the complex field-dependent behavior. Error bars indicate uncertainties in the fit results. The inset shows a sketch of the two transport channels (1) the bulk conduction electrons of the Heusler main phase and (2) the Dirac-like surface states of the Bi-Sb GB network.

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