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XRD patterns measured at room temperature for films grown on (001). Both monoclinic (an open triangle) and rutile (an arrow) phases were seen at . The rutile peaks indicated with arrows monotonically shift with increasing the W doping .
Out-of-plane lattice constant against the composition in . The dashed line is a linear fit. The -axis lattice constants of powder samples reported by Israelsson et al. (Ref. 21) are also plotted (open circles) for comparison. The in-plane lattice constants of the films are completely locked to that of substrate.
Temperature dependence of resistivity for films with different W composition: (a) and (b) . The metallic resistivity at low temperatures appeared in .
A metal-insulator phase diagram in on (001) substrates. The is almost linearly reduced until . In , the of the insulator fragment is depicted with open circles, while the system shows the metallic ground state, as shown by filled circles. The dashed lines are merely the guide to the eyes. ’s of single crystals and the Néel temperature of trirutile powder are also presented by triangles and a diamond, respectively.
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