Short Notes: Effect of the sign of charge carriers in the kinetic and magnetic anomalies of Al0.5CoCuCrNiFe high-entropy alloy

Abstract

Within the framework of the phenomenological concepts of two-component electrical conductivity, a correlation analysis of the temperature behavior of the kinetic and magnetic characteristics of the high-entropy Al0.5CoCuCrNiFe alloy in the range of Т ∼ 210–170 K was carried out. It was shown that the reason for the previously discovered anomalies in these characteristics is conversion transformations in the system of charge carriers. The “driving force” of the transformations, apparently, is a non-conformal change with temperature in the positions of the alloy atoms, which differ in size, mass, and electronic structure. This leads to the deformation of the Brillouin zones and modification of the Fermi surface. It has been shown for the first time that the spontaneous magnetization (Is) of alloys of the AlCoCuCrNiFe family contains electronic Ise and hole Ish components. In accordance with Bloch’s “T3/2” law, we concluded that the exchange interaction integral J in these alloys is also two-component. The agreement of the obtained experimental data with the results of “mechanical spectroscopy” of identical samples of Al0.5CoCuCrNiFe alloy is demonstrated.