Band and percolation approaches to low temperature properties of manganites

Conference · Sun Dec 20 04:00:00 EST 1998 · International Journal of Modern Physics B

OSTI ID:6443240

Gor'kov, L P ^[1]; Kresin, V Z ^[2]

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1. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. L.D. Landau Inst. for Theoretical Physics (Russian Federation)
2. Lawrence Berkeley Lab., CA (United States)

Properties of the parent compound, LaMnO[sub 3] are greatly affected by strong Hund's coupling. Assuming the antiferromagnetic ordering (with a low Neel temperature) along one of the cubic axes, this coupling would result in formation of disconnected ferromagnetic layers. Furthermore, in the presence of the cooperative Jahn-Teller effect the compound becomes a band insulator. At small doping (La[sub 1[minus]x]Ca[sub x]MnO[sub 3], x [much lt] 1) the band insulator phase coexists with the presence of localized holes. An insulator-ferromagnetic metal transition occurs at the percolation point x[sub c] = 0.16.

• OSTI ID: 6443240
• Report Number(s): CONF-980291--
• Conference Information: Journal Name: International Journal of Modern Physics B Journal Volume: 12:29-31
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANTIFERROMAGNETISM
CALCIUM COMPOUNDS
CRYSTAL DOPING
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
JAHN-TELLER EFFECT
LANTHANUM COMPOUNDS
MAGNETIC PROPERTIES
MAGNETISM
MANGANATES
MANGANESE COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
TRANSITION ELEMENT COMPOUNDS