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Hall effect in a martensitic transformation in Ni-Co-Mn-In Heusler alloys

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Abstract

The Hall effect, transverse magnetoresistance, and magnetization of Ni48Co2Mn35In15 Heusler alloys have been studied at T = 77–300 K in magnetic fields up to 15 kOe. It has been shown that a martensitic transformation is accompanied by a change in the sign of the constant of the ordinary Hall effect, which means a strong change in the electronic spectrum in the martensitic transformation, while the anomalous Hall effect (AHE) constant is positive in both the austenite and martensite phases. In both phases, there are no correlations between the AHE constant and the square of the resistivity, which are characteristic of the side jump mechanism in the AHE theory. In the near vicinity of the martensitic transformation, the field dependences of the Hall resistance are complex and nonmonotonic, indicating a change in the relative concentrations of the austenite and martensite phases in strong fields.

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Correspondence to A. B. Granovskii.

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Original Russian Text © V.N. Prudnikov, A.P. Kazakov, I.S. Titov, N.S. Perov, A.B. Granovskii, I.S. Dubenko, A.K. Pathak, N. Ali, A.P. Zhukov, J. Gonzalez, 2010, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 92, No. 10, pp. 735–740.

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Prudnikov, V.N., Kazakov, A.P., Titov, I.S. et al. Hall effect in a martensitic transformation in Ni-Co-Mn-In Heusler alloys. Jetp Lett. 92, 666–670 (2010). https://doi.org/10.1134/S0021364010220066

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