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The magnetoresistance of optimally doped samples manifests a temperature-independent crossing point and scaling of the form $\\rho(T,H)=\\rho_c F(|H-H_{c}|T^{-1/z\\nu})$, where $H_c$ is the field determined by the temperature-independent crossing point, and $z\\nu$ = 0.69 $\\pm$ 0.03. High resolution transmission electron microscopy measurements reveal a complex intergrown nanostructure comprising tetragonal and orthorhombic polymorphs. 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