Novel Critical Exponent of Magnetization Curves near the Ferromagnetic Quantum Phase Transitions of Sr1-xAxRuO3 (A = Ca, La0.5Na0.5, and La)

We report a novel critical exponent delta approximate to 3/2 of magnetization Curves M alpha H-1/delta near the ferromagnetic quantum phase transitions of Sr(1-x)A(x)RuO(3) (A = Ca, La0.5Na0.5, and La), which the mean field theory of the Ginzburg-Landau-Wilson type fails to reproduce. The effect of dirty ferromagnetic spin fluctuations might be the key to the small delta.