Colossal magnetoresistance in (La{sub 0.7}Sn{sub 0.3}){sub 2}Mn{sub 2}O{sub 7}

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.14125· OSTI ID:509035

Dai, S; Li, Z W; Morrish, A H; Zhou, X Z ^[1]; Zhao, J G; Xiong, X M ^[2]

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1. Department of Physics, University of Manitoba, Winnipeg, R3T 2N2 (CANADA)
2. Institute of Physics, Chinese Academy of Science, Beijing 100080, Peoples Republic of (China)

A new manganite (La{sub 0.7}Sn{sub 0.3}){sub 2}Mn{sub 2}O{sub 7} has been discovered that exhibits colossal magnetoresistance (CMR) near the Curie temperature and semiconductor-metal transition temperatures similar to that of La{sub 1{minus}x}D{sub x}MnO{sub 3} (D=Ca{sup 2+}, Pb{sup 2+}, etc.) or ABO{sub 3} compounds. X-ray photoelectron spectra establish the presence of four valent Sn and Mn ions; thus the electrical conductivity is n type rather than p type as for the ABO{sub 3} material. Also, x-ray powder diffraction indicates that the crystal structure is monoclinic. Magnetic susceptibility and M{umlt o}ssbauer spectra of {sup 57}Fe-doped samples have also been investigated. Although the resistivity of the iron-doped manganite is now larger, the CMR is actually increased. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 509035
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
CURIE POINT
LANTHANUM OXIDES
MAGNETIC SUSCEPTIBILITY
MAGNETORESISTANCE
MANGANESE OXIDES
MOESSBAUER EFFECT
PHOTOELECTRON SPECTROSCOPY
TIN OXIDES
X RADIATION
X-RAY DIFFRACTION