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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/7040

Title: Anomalous thermal expansion in orthorhombic perovskite SrIrO3: Interplay between spin-orbit coupling and the crystal lattice
Authors: Blanchard, PER
Reynolds, E
Kennedy, BJ
Kimpton, JA
Avdeev, M
Belik, AA
Keywords: ORTHORHOMBIC LATTICES
SYNCHROTRONS
NEUTRONS
DIFFRACTION
TEMPERATURE CONTROL
MAGNETIZATION
Issue Date: 16-Jun-2014
Publisher: APS Physics
Citation: Blanchard, P. E. R., Reynolds, E., Kennedy, B. J., Kimpton, J. A., Avdeev, M., & Belik, A. A. (2014). Anomalous thermal expansion in orthorhombic perovskite SrIrO3: Interplay between spin-orbit coupling and the crystal lattice. The Physical Review B, 89(21), 214106. doi: http://dx.doi.org/10.1103/PhysRevB.89.214106
Abstract: The structure of the orthorhombic (Pbnm) polytype of SrIrO3 has been investigated between 3 and 1100 K using a combination of synchrotron and neutron diffraction methods. The orthorhombic structure persists to 1100 K, the highest temperature available in this work. This is a consequence of the larger than expected octahedral tilting estimated from the neutron diffraction studies. We postulate that the strong spin-orbit coupling of the Ir4+ cation, which splits the t2g band, introduces additional strain on the lattice. This introduces unusual thermal expansion of the cell. SrIrO3 was characterized by resistivity, magnetization, and specific heat measurements. Metallic conductivity was observed between 2 and 300 K without indication of the previously reported metal-insulator transition. The Sommerfeld constant γ was 3.12(2) mJ mol−1 K−2, and a Fermi-liquid behavior was observed between 2 and 30 K with positive magnetoresistence of up to 2% (at 70 kOe and between 2 and 50 K).© 2014, American Physical Society.
URI: http://dx.doi.org/10.1103/PhysRevB.89.214106
http://apo.ansto.gov.au/dspace/handle/10238/7040
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