Search for the Quantum Critical Point in Cr_1-χV_χ Alloys

Abstract

The temperature-dependent electrical resistivity of antiferromagnetic Cr_1-χV_χ alloys (χ≤0.04) was measured under hydrostatic pressures up to 3 GPa. It was found that the Neeel temperature T_N decreases approximately linearly and the residual resistivity ρ₀ increases with increasing χ, reaching a maximum near χ=0.035. The pressure dependence of T_N is strongly dependent onχ. For Cr (χ=0), T_N decreases with increasing pressure, but the rate of decrease becomes sluggish above approximately 2 GPa. The value of T_N for χ=0.015 decreases almost linearly up to 3 GPa. On the other hand, the value of T_N for χ=0.035 reaches zero at 0.7 GPa. These results are discussed in relation to the quantum phase transition.