Bandwidth control in a perovskite-type -correlated metal I. Evolution of the electronic properties and effective mass
- 15 August 1998
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 58 (8), 4372-4383
- https://doi.org/10.1103/physrevb.58.4372
Abstract
Single crystals of the perovskite-type metallic alloy system were synthesized in order to investigate metallic properties near the Mott transition. The substitution of a ion for a ion reduces the bandwidth due to a buckling of the V-O-V bond angle from for to for Thus, the value of can be systematically controlled without changing the number of electrons making one of the most ideal systems for studying bandwidth effects. The Sommerfeld-Wilson ratio the Kadowaki-Woods ratio (in the same region as heavy fermion systems), and a large 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 to 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.
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