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Phys. Rev. B 70, 014423 (2004) [7 pages]

Reduced ferromagnetic transition temperatures in SrRu1−vO3 perovskites from Ru-site vacancies

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B. Dabrowski, O. Chmaissem, P. W. Klamut, S. Kolesnik, M. Maxwell, J. Mais, Y. Ito, and B. D. Armstrong
Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA

J. D. Jorgensen and S. Short
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

Received 26 January 2004; published 21 July 2004

We show that annealing of stoichiometric SrRuO3 perovskites in high-pressure oxygen of 600  atm near 1100  °C produces SrRu1−vO3 compounds with vacancies on the Ru-sites. The creation of Ru vacancies rapidly suppresses the ferromagnetic ordering temperature, TC , from 163  K to 45  K with an increase of v≈0.09 . Subtle structural changes that accompany the creation of Ru-site vacancies are different from the typical properties of transition metal perovskites, for which an increased formal oxidation state of the B-site cations normally leads to decreased B-O interatomic distances and contraction of the unit cell volume. The reduced charge screening caused by the Ru-vacancies offsets an expected decrease of the average interatomic distance Ru-O and rotation of the RuO6 octahedra as Sr atoms relax toward Ru-vacancies increases the observed volume.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevB.70.014423
DOI: 10.1103/PhysRevB.70.014423
PACS: 61.66.Fn, 61.12.−q, 75.90.+w

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