(Critical Behavior of the Ferromagnetic Perovskite BaRuO3

J. -S. Zhou, K. Matsubayashi, Y. Uwatoko, C. -Q. Jin, J.-G. Cheng, J. B. Goodenough, Q. Q. Liu,
T. Katsura, A. Shatskiy, and E. Ito

Phys. Rev. Lett. 101 , 077206 (2008)


  A thorough study has been made of the physical properties under high pressure of the perovskite BaRuO3 synthesized under pressure; it includes the critical behavior in the vicinity of Tc to 1 GPa and the temperature dependences of resistivity and ac magnetic susceptibility up to 8 GPa. The ferromagnetism in BaRuO3 is suppressed at 8 GPa. Critical fluctuations in the vicinity of Tc have been found in BaRuO3 and they are enhanced under pressure. These observations are in sharp contrast to SrRuO3 where mean-field behavior is found at Tc.

 (a) The Arrott plot of M(H) of BaRuO3 ; (b) the modified Arrott plot M(H) with critical parameters of a Heisenberg model; the dashed lines are the curve fitting with polynomial at high magnetic field; (c) temperature dependences of Ms and 1/χ0 with power-law fittings; (d) a scaling plot of the M(H) obtained at 38K<T<90 K with the γ and β obtained from the power-law fitting in (c).