Investigation of the field-induced phases in $\lambda $-(BETS)$_{2}$Fe$_{x}$Ga$_{1-x}$Cl$_{4}$

We investigate the nature of the magnetoresistance in the antiferromagnetic, metallic, and field-induced superconducting ground states of the quasi-two dimensional organic-magnetic conductor $\lambda $-BETS$_{2}$Fe$_{x}$Ga$_{1-x}$Cl$_{4}$ for several alloy and experimental configurations. These include a consideration of scaling-type behaviour for x = 0.47 where the field is directed in plane along the c-axis. Here we find that both the antiferromagnetic and the superconducting states follow relatively simple scaling laws with magnetic field and temperature respectively over a considerable range of the phase diagram. An investigation of systematic rotation of the magnetic field with respect to both polar and azimuthal directions for x = 0.8 in high magnetic fields is also reported for both the metallic and antiferromagnetic phases. Key words. Organic conductors – field-induced superconductivity – antiferromagnetism