Structural, electronic, and magnetic properties of La sub x Sr sub 1 minus x VO sub 3 (0. 1 le x le 1. 0)

We report on the properties of La{sub {ital x}}Sr{sub 1{minus}{ital x}}VO{sub 3} which has a phase diagram which is similar to Sr-doped La{sub 2}CuO{sub 4} in that it too shows a composition-induced insulator-to-metal transition with strontium doping. In addition, the fact that the insulating compos...

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Bibliographic Details
Published in:Physical review. B, Condensed matter Condensed matter, 1992-11, Vol.46:17
Main Authors: Mahajan, A.V., Johnston, D.C., Torgeson, D.R., Borsa, F.
Format: Article
Language:English
Subjects:
360204 - Ceramics, Cermets, & Refractories- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
ELECTRONIC STRUCTURE
ENERGY-LEVEL DENSITY
KNIGHT SHIFT
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MATERIALS SCIENCE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM OXIDES
X-RAY DIFFRACTION
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Summary:We report on the properties of La{sub {ital x}}Sr{sub 1{minus}{ital x}}VO{sub 3} which has a phase diagram which is similar to Sr-doped La{sub 2}CuO{sub 4} in that it too shows a composition-induced insulator-to-metal transition with strontium doping. In addition, the fact that the insulating compositions in the vanadium-based system are antiferromagnetic, as well as, the perovskite structure of La{sub {ital x}}Sr{sub 1{minus}{ital x}}VO{sub 3}, makes them candidates for a detailed study of their properties in order to gain greater insight into the mechanisms at play in the high-{ital T}{sub {ital c}} cuprate superconductors. Magnetic susceptibility, x-ray powder diffraction, and {sup 51}V NMR Knight shift and relaxation rates, {ital T}{sub 1}{sup {minus}1} and {ital T}{sub 2}{sup {minus}1}, are reported as functions of temperature and composition in La{sub {ital x}}Sr{sub 1{minus}{ital x}}VO{sub 3}. A combined analysis of the susceptibility and the {sup 51}V NMR data yields values of the density of states {ital D}({epsilon}{sub {ital f}}) and for the enhancement of the uniform susceptibility. These are indicative of a strongly exchange-enhanced narrow {ital d}-band metal for {ital x}{lt}0.7. No evidence was found for antiferromagnetic spin fluctuations in the metallic phase nor for superconducting behavior, in contrast to cuprate superconductors where neutron-scattering evidence shows antiferromagnetic spin correlations in the normal state of the superconducting compositions.
ISSN:0163-1829
1095-3795
DOI:10.1103/PhysRevB.46.10973