Abstract
Temperature dependences of low field Hall resistivity ρH are used to separate anomalous (ρ aH ) and normal (R H B) contributions to the Hall effect in chiral magnet MnSi (T c ≈ 29.1 K). It is found that the transition between paramagnetic (T > T c ) and magnetically ordered (T < T c ) phases is accompanied by the change in anomalous Hall resistivity from low temperature behavior governed by Berry phase effects (ρ aH = μ0 S 2ρ2 M, T < T c ) to high temperature regime dominated by skew scattering (ρ aH = μ0 S 1ρM, T > T c ). The crossover between the intrinsic (∼ρ2) and extrinsic (∼ρ) contributions to the anomalous Hall effect develops together with the noticeable increase in the concentration of charge carriers estimated from the normal Hall coefficient (from n/n Mn(T > T c ) ≈ 0.94 to n/n Mn(T < T c ) ≈ 1.5, n Mn ≈ 4.2 × 1022 cm−3). The observed features may correspond to the dramatic change in Fermi surface topology induced by the onset of long-range magnetic order in MnSi.
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Glushkov, V.V., Lobanova, I.I., Ivanov, V.Y. et al. Anomalous Hall effect in MnSi: Intrinsic to extrinsic crossover. Jetp Lett. 101, 459–464 (2015). https://doi.org/10.1134/S0021364015070085
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DOI: https://doi.org/10.1134/S0021364015070085