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Single crystals of the perovskite-type $3d^{1}$ metallic alloy systemCa$_{1-x}$Sr$_x$VO$_3$ were synthesized in order to investigate metallicproperties near the Mott transition. The substitution of a Ca$^{2+}$ ion for aSr$^{2+}$ ion reduces the band width $W$ due to a buckling of the V-O-V bondangle from $\sim180^\circ$ for SrVO$_3$ to $\sim160^\circ$ for CaVO$_3$. Thus,the value of $W$ can be systematically controlled without changing the numberof electrons making Ca$_{1-x}$Sr$_x$VO$_3$: one of the most ideal systems forstudying band-width effects. The Sommerfeld-Wilson's ratio ($\simeq2$), theKadowaki-Woods ratio (in the same region as heavy Fermion systems), and a large$T^{2}$ term in the electric resistivity, even at 300 K, substantiate a largeelectron correlation in this system, though the effective mass, obtained bythermodynamic and magnetic measurements, shows only a systematic but moderateincrease in going from SrVO$_3$ to CaVO$_3$, in contrast to the criticalenhancement expected from the Brinkmann-Rice picture. It is proposed that themetallic properties observed in this system near the Mott transition can beexplained by considering the effect of a non-local electron correlation.Comment: 14 pages in a Phys. Rev. B camera-ready format with 10 EPS figures  embedded. LaTeX 2.09 source file using "camera.sty" and "prbplug.sty"  provided by N. Shirakawa. For OzTeX (Macintosh), use "ozfig.sty" instead of  "psfig.sty". "ozfig.sty" can be also obtained by e-mail request to N.  Shirakawa: <sirakawa@etl.go.jp>. Submitted to Phys. Rev.

physical review. b, condensed matter

Bandwidth control in a perovskite-type<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mn>3</mml:mn><mml:mi>d</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>-correlated metal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></…

Bandwidth control in a perovskite-type3d1-correlated metalCa1−x