Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session H45: Charge Order
2:30 PM–5:18 PM,
Tuesday, March 6, 2018
LACC Room: 505
Sponsoring Unit: DCMP
Chair: Eduardo Da Silva Neto, Univ of California - Davis
Abstract: H45.00007 : Charge frustration in the mixed-valent iron oxide β-NaFe2O3 with a double triangular layer consisting of Fe4 tetrahedra
3:42 PM–3:54 PM
We have investigated physical properties of β-NaFe2O3 with mixed-valent Fe2.5+ ions. This compound has double triangular layers (W layers) of Fe ions similar to LuFe2O4, and however, the coordination number of Fe ions of these two compounds is different; the coordination number is six and five for β-NaFe2O3 and LuFe2O4, respectively. The W layers consist of the two-dimensional network of almost regular Fe4 tetrahedra. Thus, charge frustration is expected to be large in β-NaFe2O3. However, there are no reports on physical properties of β-NaFe2O3 to our knowledge, although there are many reports on the synthesis of this compound.
In this talk, we will report anomalous charge ordering phenomena in β-NaFe2O3. The charge ordering phenomena were investigated by means of magnetic, electrical, nuclear magnetic resonance, and synchrotron X-ray diffraction measurements. This compound shows charge and magnetic orderings at different temperature. Interestingly, this compound exhibits an electrostatically unstable CO pattern, which does not satisfy the Anderson's condition. We will discuss the effect of charge frustration and the role of electron-phonon interactions and Coulomb interactions.
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