Magnetic and Transport Properties of Co2MnSnxSb1−x Heusler Alloys

Authors

Moti R. Paudel, Southern Illinois University Carbondale
Christopher S. Wolfe, Southern Illinois University Carbondale
Heather M. A. Patton, Southern Illinois University Carbondale
Igor Dubenko, Southern Illinois University Carbondale
Naushad Ali, Southern Illinois University Carbondale
Joseph A. Christodoulides, Naval Research Laboratory
Shane Stadler, Southern Illinois University Carbondale

Comments

© 2009 American Institute of Physics

Published in Journal of Applied Physics, Vol. 105 No. 1 (2009) at doi: 10.1063/1.3054291

Abstract

We present the magnetic, structural, and transport properties of the quaternary Heusler alloys Co₂MnSn_xSb_1−x (x = 0, 0.25, 0.50, 0.75, and 1.0), which have been theoretically predicted to be half-metallic. Magnetization measurements as a function of applied field show that the saturation moment for x = 1 (Co₂MnSn) is near the Slater–Pauling value of 5μ_B; however, the moment for x = 0 (Co₂MnSb) falls far short of its predicted value of 6μ_B. Resistivity as a function of temperature was measured from 5 to 400 K, and a phase transition from a half-metallic ferromagnetic phase to a normal ferromagnetic phase was observed between 50 and 80 K for all of the alloys. At low temperature (10 K<T<40 K), the resistivity ratio was found to vary as R(T)/R(T = 5 K) = A+BT²+CT^9/2, where the T² term results from electron-electron scattering, whereas the T^9/2 term is a consequence of double magnon scattering.

Recommended Citation

Paudel, Moti R., Wolfe, Christopher S., Patton, Heather M., Dubenko, Igor, Ali, Naushad, Christodoulides, Joseph A. and Stadler, Shane. "Magnetic and Transport Properties of Co2MnSnxSb1−x Heusler Alloys." (Jan 2009).