Figure 6

(a) Magnetic field dependence of ρ for field parallel to c-axis. (b) ρ as a function of the angle (θ) between the magnetic field H and c-axis at different temperatures. (c) Magnetic field dependence of ρ for different angles θ at T = 2 K. (d) Variation of metamagnetic critical field H _c as function of θ at T = 2 K. The solid red line is a fit to the data using the equation H _c  = H _c0/cos (θ). The inset illustrates the magnetic structures in the A-type antiferromagnetic and in the field-polarised phase.