Variable-range-hopping transport in Ba sub 1 minus x K sub x BiO sub 3 (0 lt x lt 0. 35)
- AT T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey (USA)
Resistivity measurements on semiconducting single crystals and thin films of Ba{sub 1{minus}{ital x}}K{sub {ital x}}BiO{sub 3} ({ital x}{lt}0.35) grown by molecular-beam epitaxy follow the Mott variable-range-hopping law {rho}={rho}{sub 0}exp{l brace}({ital T}{sub 0}/{ital T}){sup 1/4}{r brace}. A single crystal with {ital x}=0.13 was measured over 8 orders of magnitude in resistivity at temperatures between 50 K and room temperature. The values of {ital T}{sub 0} are (3--6){times}10{sup 8} K, implying strong localization. Near the insulator-metal transition, the {ital T}{sub 0}'s depend on the stoichiometry and the agreement with the Mott law breaks down. The transport is discussed in the context of the electronic and structural phase diagram of the barium potassium bismuthate system. In particular, we find no evidence of the nonlinear transport which might be expected if incommensurate charge-density waves were the origin of the nonmetallicity of Ba{sub 1{minus}{ital x}}K{sub {ital x}}BiO{sub 3} (0{lt}{ital x}{lt}0.35).
- OSTI ID:
- 5995502
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:17; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
DIAGRAMS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
HIGH-TC SUPERCONDUCTORS
LOW TEMPERATURE
MEDIUM TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
VERY LOW TEMPERATURE