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Nature Of Lattice Distortions In The Cubic Double Perovskite Ba2naoso6

Title: Nature Of Lattice Distortions In The Cubic Double Perovskite Ba2naoso6.
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Name(s): Liu, W., author
Cong, R., author
Reyes, A. P., author
Fisher, I. R., author
Mitrovic, V. F., author
Type of Resource: text
Genre: Journal Article
Text
Journal Article
Date Issued: 2018-06-14
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: We present detailed calculations of the electric field gradient (EFG) using a point charge approximation in Ba2NaOsO6, a Mott insulator with strong spin-orbit interaction. Recent Na-23 nuclear magnetic resonance (NMR) measurements found that the onset of local point symmetry breaking, likely caused by the formation of quadrupolar order [Chen, Pereira, and Balents, Phys. Rev. B 82, 174440 (2010)], precedes the formation of long range magnetic order in this compound [Lu et al., Nat. Commun. 8, 14407 (2017); Liu et al., Physica B 536, 863 (2018)]. An extension of the static Na-23 NMR measurements as a function of the orientation of a 15 T applied magnetic field at 8 K in the magnetically ordered phase is reported. Broken local cubic symmetry induces a nonspherical electronic charge distribution around the Na site and thus finite EFG, affecting the NMR spectral shape. We combine the spectral analysis as a function of the orientation of the magnetic field with calculations of the EFG to determine the exact microscopic nature of the lattice distortions present in low temperature phases of this material. We establish that orthorhombic distortions, constrained along the cubic axes of the perovskite reference unit cell, of oxygen octahedra surrounding Na nuclei are present in the magnetic phase. Other common types of distortions often observed in oxide structures are considered as well.
Identifier: FSU_libsubv1_wos_000435332500001 (IID), 10.1103/PhysRevB.97.224103 (DOI)
Keywords: nmr, crystal, charge-density
Publication Note: The publisher’s version of record is available at https://doi.org/10.1103/PhysRevB.97.224103
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000435332500001
Owner Institution: FSU
Is Part Of: Physical Review B.
2469-9950
Issue: iss. 22, vol. 97

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Liu, W., Cong, R., Reyes, A. P., Fisher, I. R., & Mitrovic, V. F. (2018). Nature Of Lattice Distortions In The Cubic Double Perovskite Ba2naoso6. Physical Review B. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000435332500001