Magnetic, transport and thermal properties of single crystal Co2FeGa

The magnetic, transport and thermal properties of single crystal Co2FeGa have been investigated. The small coercivity 20 Oe and saturation field 4000 Oe of Co2FeGa sample at temperature 5 K indicates that the single crystal is magnetically soft. The resistivity (rho) behaves according to rho similar to T-1/2 power law below temperature T = 40 K, which is due to electron-electron interaction effects in the presence of disorder. The thermal conductivity of Co2FeGa single exhibits anomalous temperature dependence above 50 K, i.e., the conductivity increases with the temperature, or dk/dT > 0. We conclude that this anomalous thermal conductivity is due to the strong atomic disorder between the Fe and Co atoms. (C) 2007 Elsevier B.V. All rights reserved