研究目的
To control the chemical composition of YbFe2O4 epitaxial thin films and study the effect of iron composition on the charge ordering transition.
研究成果
The chemical composition of the YbFe2O4 epitaxial films is strongly associated with the charge ordering. The threshold electric field (Eth) decreased as the Fe/Yb composition ratio approached the stoichiometric composition, indicating a change in the robustness of the charge order as a function of iron composition.
研究不足
The study was limited by the difficulty in forming the YbFe2O4 crystal itself and keeping the stoichiometry. The process window to form the YbFe2O4 epitaxial films is very narrow.
1：Experimental Design and Method Selection:
The study used pulsed laser deposition (PLD) method with ArF and KrF excimer lasers to fabricate YbFe2O4 thin films. The amount of active oxygen species was controlled by varying the laser power and laser power density.
2：Sample Selection and Data Sources:
(111) YSZ was used as the substrate. Yb2O3 and α-Fe2O3 powders were carefully weighed to yield chemical compositions of Fe/Yb = 2 and
3：List of Experimental Equipment and Materials:
ArF and KrF excimer lasers, (111) YSZ substrate, Yb2O3 and α-Fe2O3 powders, alumina crucible, X-ray diffraction (XRD) with Cu-Kα radiation, energy-dispersive X-ray spectroscopy (EDX).
4：Experimental Procedures and Operational Workflow:
The powder mixtures were calcined, attrition milled, pressed into pellets, and sintered. The deposition was carried out without gas flow at a temperature ranging from 800 °C to 900 °C.
5：Data Analysis Methods:
XRD was used to characterize the crystal structure of the films. The film composition was determined by EDX. I–V characteristics were evaluated using the two probe method.
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