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Magnetic properties of substituted SrRuO 3
Author(s) -
Dabrowski B.,
Kolesnik S.,
Chmaissem O.,
Maxwell T.,
Mais J.,
Jorgensen J. D.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200562525
Subject(s) - magnetization , ferromagnetism , paramagnetism , crystallite , magnetic moment , bond length , ion , crystallography , condensed matter physics , materials science , lattice (music) , molecular geometry , lattice constant , chemistry , crystal structure , magnetic field , physics , molecule , diffraction , organic chemistry , quantum mechanics , acoustics , optics
We have investigated structural and magnetic properties of the SrRu 1– v O 3 and SrRu 1– x Cr x O 3 perovskites with uniquely suppressed and increased ferromagnetic transition temperatures, respectively. Polycrystalline samples synthesized in 600 atm. O 2 at 1100 °C and in air at 1340 °C reach the v and Cr solubility limits at v ∼ 0.10 and x = 0.15, respectively. The ordered moment is dramatically suppressed by the creation of Ru vacancies. The linear decrease of the lattice parameters and bond lengths, and an increase of the bond angles with increasing x are due to substitution of the smaller Cr 4+/3+ ion for Ru 4+/5+ . Similar decreases of the molar susceptibility, χ m , in the paramagnetic region above T C and the high‐field magnetization at 5 K with x also indicate the presence of the Cr 4+/3+ and Ru 4+/5+ ions. These results confirm that the Ru 4+/5+ (d 4/3 )–O 2– –Cr 4+/3+ (d 2/3 ) minority band double‐exchange interaction that involves the Cr 3+ and Cr 4+ in the magnetic ordering is responsible for the enhanced ordering temperature. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)