Metal-insulator transition in the system (Ca/sub 1-x/La/sub x/)MnO/sub 2. 97 (0. 05 less than or equal to x less than or equal to 0. 4)

Journal Article · Tue Jul 01 04:00:00 EDT 1986 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(86)90180-5· OSTI ID:5405578

Taguchi, H; Shimada, M

The electrical resistivity of (Ca/sub 1-x/La/sub x/)MnO/sub 2.97/ (0.05 less than or equal to x less than or equal to 0.4) was measured in the temperature range from 80 to 1000 K. All manganates are n-type semiconductors below room temperature. Below 125 K, the electrical resistivity follows the Mott's T/sup -1/4/ law indicating the possible occurrence of variable hopping of electrons due to Anderson localization. Above ca. 400-450 K, all manganates exhibit a metal-insulator transition without crystallographic change. From the results of magnetic measurement, the mechanism of the metal-insulator transition is explained by the band model of covalency criterion for localized vs collective electrons in oxides with the perovskite structure.

• Research Organization: Osaka Prefectural Industrial Research Institute, Japan
• OSTI ID: 5405578
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 63:2; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPLEXES
CALCIUM COMPLEXES
CHALCOGENIDES
COHERENT SCATTERING
COMPLEXES
DATA
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
HIGH TEMPERATURE
INFORMATION
LANTHANUM COMPLEXES
LOW TEMPERATURE
MANGANESE COMPOUNDS
MANGANESE OXIDES
MATERIALS
MEDIUM TEMPERATURE
N-TYPE CONDUCTORS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
RARE EARTH COMPLEXES
SCATTERING
SEMICONDUCTOR MATERIALS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION