Independent Ordering of Two Interpenetrating Magnetic Sublattices in the Double Perovskite Sr2CoOsO6
| Autor: | Molly R. Ball, Bernd Büchner, Patrick M. Woodward, Oscar D. Restrepo, Sabine Wurmehl, Ryan Morrow, Wolfgang Windl, U. Stockert, Rohan Mishra |
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| Rok vydání: | 2013 |
| Předmět: |
Condensed matter physics
Spins Chemistry media_common.quotation_subject Inorganic chemistry Frustration General Chemistry Cubic crystal system Biochemistry Catalysis Ion Tetragonal crystal system Colloid and Surface Chemistry Superexchange Condensed Matter::Strongly Correlated Electrons Density functional theory Monoclinic crystal system media_common |
| Zdroj: | Journal of the American Chemical Society. 135:18824-18830 |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | The insulating, fully ordered, double perovskite Sr2CoOsO6 undergoes two magnetic phase transitions. The Os(VI) ions order antiferromagnetically with a propagation vector k = (1/2, 1/2, 0) below TN1 = 108 K, while the high-spin Co(II) ions order antiferromagnetically with a propagation vector k = (1/2, 0, 1/2) below TN2 = 70 K. Ordering of the Os(VI) spins is accompanied by a structural distortion from tetragonal I4/m symmetry to monoclinic I2/m symmetry, which reduces the frustration of the face centered cubic lattice of Os(VI) ions. Density functional theory calculations show that the long-range Os-O-Co-O-Os and Co-O-Os-O-Co superexchange interactions are considerably stronger than the shorter Os-O-Co interactions. The poor energetic overlap between the 3d orbitals of Co and the 5d orbitals of Os appears to be responsible for this unusual inversion in the strength of short and long-range superexchange interactions. |
| Databáze: | OpenAIRE |
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