Insulator-metal transitions, giant magnetoresistance, and related aspects of the cation-deficient LaMnO{sub 3} compositions La{sub 1-{delta}}MnO{sub 3} and LaMn{sub 1-{delta}}O{sub 3}

Journal Article · Fri Nov 15 04:00:00 EST 1996 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1996.0360· OSTI ID:555036

Arulraj, A; Mahesh, R; Subbanna, G N ^[1]

---

1. Indian Institute of Science, Bangalore (India); and others

Electron transport and magnetic properties of the cation-deficient compositions of LaMnO{sub 3} with the nominal formulae La{sub 1-{delta}}MnO{sub 3} (0.0 {le} {delta} {le} 0.2) and LaMn{sub 1-{delta}}O{sub 3} (0.0 {le} {delta}{prime} {le} 0.2) were investigated after their defect structures were examined. La{sub 1-{delta}}MnO{sub 3} ({delta} = 0.1) contains more than one defect structure involving both La and Mn vacancies. La{sub 1-{delta}}MnO{sub 3} (0.0 {le} {delta} {le} 0.2) compositions are all ferromagnetic and show insulator-metal (I-M) transition, with the resistivity decreasing with increasing {delta}. LaMn{sub 1-{delta}{prime}}O{sub 3} compositions show ferromagnetism and the I-M transition only up to {delta}{prime} = 0.05, with the resistivity increasing with {delta}{prime}. All compositions showing the I-M transitions exhibit giant magnetoresistance.

• OSTI ID: 555036
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 127; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL DEFECTS
ELECTRIC CONDUCTIVITY
LANTHANUM COMPOUNDS
MAGNETORESISTANCE
MANGANATES
STOICHIOMETRY