Spin Disordered Resistivity of the Heusler Ni₂MnGa-based Alloys

• Authors: J. Kamarád , J. Kaštil , F. Albertini , S. Fabbrici , Z. Arnold
• Languages of publication: EN

Abstracts

EN

Electrical resistivity of the selected Heusler off-stoichiometric (NiCo)₂Mn(GaIn) alloys was studied in a wide range of temperature and magnetic field. A step-like change of resistivity (Δρ ≈24 μΩcm) was detected in the off-stoichiometric Ni_{1.85}Mn_{1.21}Ga_{0.94} alloy at temperature of martensitic structural transition. This Δρ is much more significant than one in the stoichiometric Ni₂MnGa alloy. In the case of the off-stoichiometric (NiCo)₂Mn(GaIn) alloys, an enormous change of resistivity, Δρ ≈ 200 μΩcm, accompanies the structural transition. Simultaneously, the maximum of the spin disordered resistivity ρ_{sd}(T) of austenite phase of the alloys is slightly dependent on composition of the alloy and vary from ≈30 μΩcm up to ≈45 μΩcm, in good agreement with theoretical calculations. Due to high sensitivity of the structural transition temperature of the alloys to magnetic field, the very pronounced magnetoresistance effects have been observed in the studied alloys.

Keywords

EN

75.50.Cc; 81.30.Kf; 72.15.Eb; 75.47.De

Discipline

• 75.50.Cc: Other ferromagnetic metals and alloys
• 72.15.Eb: Electrical and thermal conduction in crystalline metals and alloys
• 75.47.De: Giant magnetoresistance
• 81.30.Kf: Martensitic transformations

• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 1072-1074

Dates

published

2017-04

Contributors

author

J. Kamarád

• Institute of Physics, ASCR, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic

author

J. Kaštil

• Institute of Physics, ASCR, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic

author

F. Albertini

• IMEM CNR, Parco Area delle Scienze 37/A, I-43124 Parma, Italy

author

S. Fabbrici

• IMEM CNR, Parco Area delle Scienze 37/A, I-43124 Parma, Italy

author

Z. Arnold

• Institute of Physics, ASCR, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic

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Identifiers

DOI

10.12693/APhysPolA.131.1072