Tunnel-type giant magnetoresistance in the granular perovskite La{sub 0.85}Sr{sub 0.15}MnO{sub 3}

Journal Article · Wed Oct 01 00:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.8138· OSTI ID:632603

Zhang, N ^[1]; Ding, W; Zhong, W; Xing, D; Du, Y ^[1]

---

1. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093 (China)

The grain-size-dependent transport properties in the granular perovskite La{sub 0.85}Sr{sub 0.15}MnO{sub 3} have been investigated. A giant magnetoresistance (GMR) effect, similar to that observed in granular transition metals, and a crystal intrinsic colossal magnetoresistance (CMR) have been simultaneously observed. With grain growth, the GMR effect gradually weakens and the intrinsic CMR effect becomes prominent in the present granular system. A resistivity formula originating from interfacial tunneling is obtained and the theoretical calculation is found to be in good agreement with our experimental results. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 632603
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 13 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GRAIN GROWTH
GRAIN SIZE
GRANULAR MATERIALS
LANTHANUM OXIDES
MAGNETORESISTANCE
MANGANESE OXIDES
STRONTIUM OXIDES
TUNNEL EFFECT