Ru99Mössbauer effect study of off-stoichiometricSrRu1−v

perturbed angular correlation and Mössbauer effect investigations of SrRuO3 and CaRuO3

“…[1] but slightly lower than the already reported values of TC near 160 K reported for example in Ref. [2].…”

“…SrRuO 3 is a ferromagnet with a high Curie temperature T C 160 K [1], which strongly depends on occupation of the ruthenium sublattice and decreases even to 45 K for SrRu 0.88 O 3 [2]. Above the ordering temperature, magnetic susceptibility is well described by the Curie-Weiss dependence with the ruthenium effective magnetic moment eff 2.8 B [1].…”

“…The distribution of the hyperfine field does not allow us do draw a convincing conclusion regarding the critical exponent. The distribution of T C is probably related to the strong dependence of T C on the sample stoichiometry [2]. A small Ru non-stoichiometry leads to vacancies in the crystal structure and the occurrence of Ru atoms with 5 Ru neighbors instead of 6.…”

“…The high temperature magnetic susceptibility of CaRuO 3 is well described by the Curie-Weiss law with ruthenium effective magnetic moment eff 3.2 B and a large and negative paramagnetic Curie temperature  p −150 K [1,2]. Lack of any long-range magnetic order at 1.5 K has been inferred from the neutron diffraction measurements [4].…”