Cu[Li<sub>1/3</sub>Sn<sub>2/3</sub>]O<sub>2</sub> and Cu[Na<sub>1/3</sub>Sn<sub>2/3</sub>]O<sub>2</sub>: Crystal Structure and Phonon Dispersion in Quaternary Honeycomb Delafossites
ORAL
Abstract
Magnetic materials with spin-1/2 ions on a two dimensional honeycomb lattice are candidates for a Kitaev spin liquid phase. The study of non-magnetic honeycomb delafossites provides a basis to model the physical properties of magnetic honeycomb materials. Here, we report two new quaternary non-magnetic delafossites, Cu[Li1/3Sn2/3]O2 and Cu[Na1/3Sn2/3]O2, with honeycomb ordering synthesized via a topotactic cation-exchange reaction. The monoclinic C2/c space group and twinned stacking faults are determined from the Rietveld refinement and TEM analysis. Additionally, the phonon heat capacity for these non-magnetic layered oxides is captured accurately by first principles calculations. These results are an important step toward having a reliable model to calculate phonon contribution to the heat capacity in magnetic delafossites1.
[1] Inorganic Chemistry 57, 12709 (2018).
[1] Inorganic Chemistry 57, 12709 (2018).
*NSF-1708929
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Presenters
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Faranak Bahrami
- Physics, Boston College
- Department of Physics, Boston College