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Direct observation of the lattice precursor of the metal-to-insulator transition in V2O3 thin films by surface acoustic waves
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10.1063/1.4794948
/content/aip/journal/apl/102/10/10.1063/1.4794948
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/10/10.1063/1.4794948
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Sketch of the SAW transmission delay line with two IDTs on top of a LiNbO3 substrate. The V2O3 film to be investigated is grown on top of a Cr/Cr2O3 layer, which is directly deposited on the LiNbO3 substrate. The length of the sound path between the IDTs is LSP = 2.654 mm, the length of the V2O3 film is LV2O3 = 2.233 mm, the total length of the Cr/Cr2O3 layer extending the V2O3 layer is ΔLCr/Cr2O3 = (53 μm + 92 μm) on the left and right side, respectively. The length of the uncovered sound path ΔLuc = (3 μm + 274 μm) for left and right, respectively. The dimension of one IDT is LIDT = 474 μm, and the propagation length of the SAW therein is 334 μm. All geometrical distances were determined by a scanning electron microscope.

Image of FIG. 2.
FIG. 2.

Resistance, R, as a function of temperature, T, for a V2O3 film. The inset shows the derivative of the curve. (a) V2O3 grown directly on a LiNbO3 substrate. (b) V2O3 grown on a Cr/Cr2O3 layer sublayer coating the LiNbO3 substrate.

Image of FIG. 3.
FIG. 3.

Normalized sound velocity shift vs. temperature: Δv/v0(T)= [vV2O3-vsc(T) + x]/v0(T). The V2O3 film was directly deposited on the LiNbO3 substrate (cooling-warming cycle). Here x = 49.1 m/s and x = 46 m/s for cooling and warming, respectively. The inset shows the “precursor region” in higher magnification.

Image of FIG. 4.
FIG. 4.

Magnified representation of the normalized sound velocity shift vs. temperature: Δv/v0(T) = [vV2O3-vsc(T) + x]/v0(T). The V2O3 film was directly deposited on the LiNbO3 substrate. (a) Cooling, x = 49.1 m/s, (b)warming, x = 46 m/s. In addition the derivative of the lg(R(T)) curve of the V2O3 film is plotted.

Image of FIG. 5.
FIG. 5.

Normalized sound velocity shift vs. temperature: Δv/v0(T)= [vV2O3-vsc(T) + x]/v0(T) for a V2O3 film grown on a Cr/Cr2O3 layer, deposited on the LiNbO3 substrate, shielding the electric wave of the SAW. (a)Cooling, x = 3.1 m/s, (b) warming, x = 3.1 m/s. In addition the derivative of the lg(R(T)) curve of the V2O3 film is plotted.

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/content/aip/journal/apl/102/10/10.1063/1.4794948
2013-03-13
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Direct observation of the lattice precursor of the metal-to-insulator transition in V2O3 thin films by surface acoustic waves
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/10/10.1063/1.4794948
10.1063/1.4794948
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