Effect of Pressure on the Néel Temperature and the Electrical Resistivity of α-Mn and α-Mn0.92Fe0.08 Alloy

Measurements of the pressure-temperature variations of the electrical resistivity were made on the antiferromagnetic α-Min and the α-Min 0.92 Fe 0.08 alloy from 4.2 K to room temperature and up to about 8 kbar. The pressure coefficients of the residual resistivity, the spindisorder resistivity and the Néel temperature T N are estimated. The pressure dependence of the resistivtity is discussed in terms of the magnetic superzone boundary effect based on the RKKY mechanism. It is suggested that the resistivity is enhanced by about ten times larger than that in the absence of the magnetic gaps at absolute zere temperature for pure α-Min. The pressure dependence of T N is also discussed with the RKKY interaction, comparing to the variation of T N with the electron-atom ratio at atmospheric pressure.