Bandwidth control in a perovskite-type3d1-correlated metalCa1−xSrxVO3.I. Evolution of the electronic properties and effective mass
Citations Over TimeTop 10% of 1998 papers
Abstract
Single crystals of the perovskite-type ${3d}^{1}$ metallic alloy system ${\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{VO}}_{3}$ were synthesized in order to investigate metallic properties near the Mott transition. The substitution of a ${\mathrm{Ca}}^{2+}$ ion for a ${\mathrm{Sr}}^{2+}$ ion reduces the bandwidth $W$ due to a buckling of the V-O-V bond angle from $\ensuremath{\sim}180\ifmmode^\circ\else\textdegree\fi{}$ for ${\mathrm{SrVO}}_{3}$ to $\ensuremath{\sim}160\ifmmode^\circ\else\textdegree\fi{}$ for ${\mathrm{CaVO}}_{3}.$ Thus, the value of $W$ can be systematically controlled without changing the number of electrons making ${\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{VO}}_{3}:$ one of the most ideal systems for studying bandwidth effects. The Sommerfeld-Wilson ratio $(\ensuremath{\simeq}2),$ the Kadowaki-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 large electron correlation in this system, though the effective mass, obtained by thermodynamic and magnetic measurements, shows only a systematic but moderate increase in going from ${\mathrm{SrVO}}_{3}$ to ${\mathrm{CaVO}}_{3},$ in contrast to the critical enhancement expected from the Brinkmann-Rice picture. It is proposed that the metallic properties observed in this system near the Mott transition can be explained by considering the effect of a nonlocal electron correlation.
Related Papers
- → Electrical resistivity of TiB2 at elevated pressures and temperatures(1996)24 cited
- → Anomalous electrical resistivity of thin gadolinium films(1974)22 cited
- → Electrical resistivity of amorphous Ni80−xMxB16Si4 alloys(1982)10 cited
- → Electrical resistivity of REAl6Fe6compounds (RE=Y, Gd, Tb, Dy, Ho, and Er)(1988)3 cited
- → Some Considerations on the Apparent Resistivity in the Cross Hole Resistivity Method(2001)