Magnetism, superconductivity, and the metal-nonmetal transition in the spinel LiM sub x Ti sub 2-x O sub 4; M = Al sup 3+ ,Cr sup 3+
- Cornell Univ., Ithaca, NY (USA)
- University Chemical Laboratory, Cambridge (England) Univ. of Cambridge (England)
- GEC Hirst Research Centre, Middlesex (England)
In the LiM{sub x}Ti{sub 2-x}O{sub 4} (M = Cr{sup 3+}, Al{sup 3+}) spinel solid solution systems, the M{sup 3+} cations substitute at the octahedral sites and thus directly interact with the titanium 3d conduction electrons. The effect is dramatically illustrated in the chromium series where superconductivity is suppressed completely at 2.5% Cr{sup 3+} substitution by a magnetic impurity effect. Infrared transmission measurements indicate a metal-nonmetal transition (MNMT) in LiCr{sub x}Ti{sub 2-x}O{sub 4} at 0.33 < x < 0.40. In the aluminum series, the superconducting transition temperature {Tc} persists at a high value (> 6 K) to x = 0.33, where a MNMT is proposed. Percolation, disproportionation, and conduction electron concentration are briefly discussed as possible contributing mechanisms for the MNMT in the cation-substituted LiM{sub x}Ti{sub -x}O{sub 4} (M = Li{sup +}, Al{sup 3+}, Cr{sup 3+}) system.
- OSTI ID:
- 6115640
- Journal Information:
- Journal of Solid State Chemistry; (USA), Vol. 89:2; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM OXIDES
MAGNETIC SUSCEPTIBILITY
SUPERCONDUCTIVITY
CHROMIUM OXIDES
LITHIUM OXIDES
TITANIUM OXIDES
EXPERIMENTAL DATA
MEASURING METHODS
SOLID SOLUTIONS
SPINELS
TRANSITION TEMPERATURE
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHROMIUM COMPOUNDS
DATA
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
INFORMATION
LITHIUM COMPOUNDS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MAGNETIC PROPERTIES
MINERALS
MIXTURES
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SOLUTIONS
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity