Metal-insulator transition in the system (Gd sub 1 minus x Ca sub x )MnO sub 2. 98

Journal Article · Fri Sep 01 04:00:00 EDT 1989 · Journal of Solid State Chemistry; (USA)

DOI:https://doi.org/10.1016/0022-4596(89)90215-6· OSTI ID:6951108

Taguchi, H; Nagao, M ^[1]; Shimada, M ^[2]

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1. Okayama Univ. (Japan)
2. Tohoku Univ., Sendai (Japan)

The electrical resistivity of (Gd{sub 1{minus}x}Ca{sub x})MnO{sub 2.98} (0.5 {approx lt} x {approx lt} 0.9) was measured in the temperature range 80 to 900 K. At low temperature, manganates are semiconductors, and the electrical resistivity follows the Mott's T{sup {minus}1/4} law, indicating the possible occurrence of variable range hopping of electrons due to Anderson localization. At high temperature, manganates (0.6 {approx lt} x {approx lt} 0.9) exhibit a metal-insulator transition without any crystallographic change. From the results of the magnetic susceptibility measurement, it is concluded that the metal-insulator transition is caused by a change in the spin state of trivalent manganese ion in (Gd{sub 1{minus}x}Ca{sub x})MnO{sub 2.98}.

• OSTI ID: 6951108
• Journal Information: Journal of Solid State Chemistry; (USA), Journal Name: Journal of Solid State Chemistry; (USA) Vol. 82:1; ISSN JSSCB; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360000* -- Materials
360100 -- Metals & Alloys
360104 -- Metals & Alloys-- Physical Properties
ALKALINE EARTH METALS
CALCIUM
CALCULATION METHODS
DATA
DATA ANALYSIS
ELECTRICAL PROPERTIES
ELEMENTS
EXPERIMENTAL DATA
GADOLINIUM
HIGH TEMPERATURE
INFORMATION
LOW TEMPERATURE
MANGANATES
MANGANESE COMPOUNDS
MATERIALS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTHS
SEMICONDUCTOR MATERIALS
TRANSITION ELEMENT COMPOUNDS