Phys. Rev. B 71, 104411 (2005) [5 pages]Freezing of octahedral tilts below the Curie temperature in SrRu1−vO3 perovskitesReceived 1 October 2004; published 21 March 2005 The crystal structure and magnetic properties of SrRu1−vO3 samples annealed in air (v=0) and high oxygen pressure (v=0.02 and 0.09) were studied as a function of temperature between 10 K and room temperature. Neutron powder diffraction analysis revealed that below TC=163 K the b and c lattice parameters and the unit cell volume are virtually temperature independent for the stoichiometric material whereas this behavior is less pronounced in the Ru-deficient samples with decreased TC=135 K and 82 K. We show that this previously reported Invar effect below the ferromagnetic ordering temperature originates from freezing of the octahedral tilting about the [001] axis that can be observed for both stoichiometric and Ru-deficient samples. Spontaneous magnetostriction has the largest effect on the b axis of the orthorhombic Pbnm crystal structure. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.71.104411
DOI:
10.1103/PhysRevB.71.104411
PACS:
75.90.+w, 61.66.Fn, 61.12.−q
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