Universal behaviour of thermal and electrical transport coefficients near the néel temperature of Cr 99.94Al 0.06

Abstract

Measurements of electrical and thermal transport coefficients in the antiferromagnetic alloy Cr 99.94Al 0.06 reveal an anomaly near the Néel temperature T N . Temperature derivatives of the electrical resistivity and thermo-power are analysed and are shown to be proportional to each other above and below T N in the reduced temperature range 6 × 10 −2 ⩾| t|⩾ 4 × 10 −4. This is consistent with the theoretical prediction of a universal critical behaviour of all transport coefficients.