The dependence of the Curie temperature Tc on nearly hydrostatic pressure has been determined to 17.2 GPa for the weak itinerant ferromagnetic SrRuO3 in both polycrystalline and single-crystalline form. Tc is found to decrease under pressure from 162 K to 42.7 K at 17.2 GPa in nearly linear fashion at the rate dTc/dP = -6.8 K/GPa. No superconductivity was found above 4 K in the pressure range 17 to 34 GPa. Room-temperature X-ray diffraction studies to 25.3 GPa reveal no structural phase transition but indicate that the average Ru-O-Ru bond angle passes through a minimum near 15 GPa. The bulk modulus and its pressure derivative were determined to be B =192(3) GPa and B' = 5.0(3), respectively. Parallel ac susceptibility studies on polycrystalline CaRuO3 at 6 and 8 GPa pressure found no evidence for either ferromagnetism or superconductivity above 4 K.
@article{arxiv.cond-mat/0609149,
title = {Studies on the Weak Itinerant Ferromagnet SrRuO3 under High Pressure to 34 GPa},
author = {J. J. Hamlin and S. Deemyad and J. S. Schilling and M. K. Jacobsen and R. S. Kumar and A. L. Cornelius and G. Cao and J. J. Neumeier},
journal= {arXiv preprint arXiv:cond-mat/0609149},
year = {2009}
}