Enhanced electron-lattice coupling in La{sub 1{minus}x}Sr{sub x}MnO{sub 3} near the metal-insulator phase boundary

Journal Article · Sat Nov 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.12190· OSTI ID:553087

Moritomo, Y ^[1]; Asamitsu, A ^[1]; Tokura, Y ^[1]

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1. Joint Research Center for Atom Technology (JRCAT), Tsukuba 305 (Japan)

Effects of hydrostatic pressure on the magnetic and transport properties have been investigated for melt-grown crystals of La{sub 1{minus}x}Sr{sub x}MnO{sub 3} with a finely-controlled doping level x near the metal-insulator phase boundary. Application of pressure affects the critical temperatures for the orthorhombic-rhombohedral structural transition (T{sub s}) as well as for the metal-insulator transition (T{sub MI}) that has been interpreted in terms of an ordering of the Jahn-Teller polarons. Reflecting that the kinetic energy of the e{sub g} carriers sensitively depends on the degree of the lattice distortion, T{sub s} shows an abrupt decrease under pressure when it crosses the magnetic phase boundary. On the other hand, T{sub MI} is significantly suppressed under pressure via enhanced e{sub g}-electron hopping. These pressure effects are compared with those of an external magnetic field. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 553087
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 19 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELECTRIC CONDUCTIVITY
FERROMAGNETIC MATERIALS
JAHN-TELLER EFFECT
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LATTICE PARAMETERS
MAGNETIC FIELDS
MANGANESE OXIDES
PHASE TRANSFORMATIONS
POLARONS
PRESSURE DEPENDENCE
STRONTIUM COMPOUNDS
STRONTIUM OXIDES