Critical exponents and amplitudes of the ferromagnetic transition in La0.1Ba0.9VS3

To study the origin of the magnetic transition in BaVS3, we measured the dc magnetization on La0.1Ba0.9VS3 sintered samples near the ferromagnetic transition. Effective critical exponents and amplitudes are obtained by means of standard modified Arrot plots and the Kouvel-Fisher method, while asymptotic critical exponents and amplitudes are obtained by means of "correction to scaling" analysis. The two methods yield similar results, but the latter is superior with respect to the achieved uncertainty. The obtained results indicate that the universality class of magnetic interactions driving the transition changes from short to long range when cooling through T-c.