Structural, electronic, and magnetic properties of La sub x Sr sub 1-x VO sub 3 (0 <= x <= 1. 0)
We report on the properties of La{sub x}Sr{sub 1-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 insulating compositions in the vanadium based system are antiferromagnetic and the La{sub x}Sr{sub 1-x}VO{sub 3} system has a pervoskite structure. These features are reminiscent of the properties of the high-{Tc} cuprate superconductors. This makes La{sub x}Sr{sub 1-x}VO{sub 3} a candidate for a detailed study of its properties in order to gain a greater insight into the mechanisms at play in the high-{Tc} cuprate superconductors. Magnetic susceptibility, X-ray powder diffraction and {sup 51}V NMR Knight shift and relaxation rates, T{sub 1}{sup {minus}1} and T{sub 2}{sup {minus}1}, are reported as functions of temperature and composition in La{sub x}Sr{sub 1-x}VO{sub 3}. A combined analysis of the susceptibility and the {sup 51}V NMR data yields values of the density of states D({epsilon}{sub f}) and for the enhancement of the uniform susceptibility. These are indicative of a strongly exchange enhanced narrow d-band metal for x < 0.7. No evidence was found for antiferromagnetic spin fluctuations in the metallic phase nor for superconducting behaviour, in these compounds. We have extensively investigated the properties of LaVO{sub 3}. We have observed diamagnetism in this compound, which is an antiferromagnetic insulator, below the Neel temperature under field-cooled conditions. We observe hysteresis magnetization versus applied field M(2) isotherms below the Neel temperature.
- Research Organization:
- Ames Lab., IA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6256174
- Report Number(s):
- IS-T-1537; ON: DE92003808
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
HIGH-TC SUPERCONDUCTORS
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
MAGNETIC PROPERTIES
LANTHANUM COMPOUNDS
STRONTIUM COMPOUNDS
VANADIUM OXIDES
NUCLEAR MAGNETIC RESONANCE
PHASE DIAGRAMS
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
DIAGRAMS
DIFFRACTION
MAGNETIC RESONANCE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RESONANCE
SCATTERING
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
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