Full text loading...
(a) XRD θ/2θ scans for four Sr2CrReO6 films deposited at = 25 (red), 26.25 (blue), 27.5 (green), and 28.75 (black) μTorr on Sr2CrNbO6 buffer layers on SrTiO3 (001) substrates near the Sr2CrReO6 (004) and Sr2CrNbO6 (004) peaks. All four scans show pronounced Laue oscillations of two periods due to the 180-nm Sr2CrReO6 and the 30 - to 48-nm Sr2CrNbO6 buffer layers. (b) Representative off-axis θ/2θ scan for the Sr2CrReO6 film grown at = 28.75 μTorr near the Sr2CrReO6 (022) and Sr2CrNbO6 (022) peaks at a tilt angle Ψ = 45°. (c) Φ scans of the SrTiO3 (011), Sr2CrReO6 (022), and Sr2CrNbO6 (022) planes at a tilt angle of Ψ = 45° for the film grown at = 28.75 μTorr, demonstrating the epitaxial relationship among the Sr2CrReO6 film, the Sr2CrNbO6 buffer layer, and the substrate. In (a) and (c), the scans are offset for clarity.
(a) Logarithmic ρ vs. T plots of the four Sr2CrReO6 films grown at = 25 (red), 26.25 (blue), 27.5 (green), and 28.75 (black) μTorr. (b) lnρ vs. 1000/T plots of the four Sr2CrReO6 films between 90 and 167 K. The linear dependence of all four curves indicates thermally activated transport and the activation energies obtained are E a = 34.9, 29.1, 28.1, and 26.5 meV for the films grown at = 25, 26.25, 27.5, and 28.75 μTorr, respectively. (c)lnρ vs. (1/T)0.25 plots of the four films between 8 and 40 K. The three films grown at ≥ 26.25 μTorr show linear behavior in the plots, indicating variable-range hopping at low temperatures while the one for = 25 μTorr does not follow a line.
In-plane magnetic hysteresis loops of the four Sr2CrReO6 films grown at various and T = 100 K. The measured values of M S are 1.01, 1.06, 0.93, and 0.82 μ B/f.u. at = 25, 26.25, 27.5, and 28.75 μTorr, respectively.
Electrical and magnetic characteristic parameters of the Sr2CrReO6 films grown at = 25, 26.25, 27.5, and 28.75 μTorr.
Article metrics loading...