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

• Published in: JETP letters Vol. 92; no. 10; pp. 666 - 670
• Main Authors: Prudnikov, V. N., Kazakov, A. P., Titov, I. S., Perov, N. S., Granovskii, A. B., Dubenko, I. S., Pathak, A. K., Ali, N., Zhukov, A. P., Gonzalez, J.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.11.2010
• Subjects: Atomic; Biological and Medical Physics; Biophysics; Condensed Matter; Molecular; Optical and Plasma Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Quantum Information Technology; Solid State Physics; Spintronics; Martensitic Transformation; Martensite Phase; JETP Letter; Martensite; Austenite
• ISSN: 0021-3640; 1090-6487
• DOI: 10.1134/S0021364010220066

The Hall effect, transverse magnetoresistance, and magnetization of Ni 48 Co 2 Mn 35 In 15 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.