| Original Articles |
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Magnetic and Transport Properties of Oxygen-Deficient Perovskite Manganites |
| ZHONG Wei1;JIANG Hong-Ying1;WU Xiao-Ling1;TANG Nu-Jiang1;CHEN Wei2;DU You-Wei1 |
| 1National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093
2Department of Physics, Heibei Normal University, Shijiazhuang 050091 |
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| Cite this article: |
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ZHONG Wei, JIANG Hong-Ying, WU Xiao-Ling et al 2003 Chin. Phys. Lett. 20 742-745 |
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Abstract Effects of oxygen deficiency on the magnetic and transport properties of La2/3Ba1/3MnO3-δ polycrystalline perovskites have been investigated. As the nonstoichiometry parameter δ increases from 0.00 to 0.10, the lattice parameters at room temperature increase from 3.892(3)Å to 3.909(3)Å, the resistivity increases and the ferromagnetic ordering transition temperature shifts from 337 K to 268 K. A large magnetoresistance effect with -Δρ/ρ0 of about 30% (955 kA/m, δ = 0.10) and a large magnetic entropy change of about 2.7 J/kg.K (796kA/m, δ = 0.00) is obtained in polycrystalline La2/3Ba1/3MnO3-δ. The enhanced magnetoresistance effect at low temperature would be related to the grain boundaries of the polycrystalline samples.
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| Keywords:
75.30.Sg
75.47.De
81.07.Bc
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Published: 01 May 2003
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| PACS: |
75.30.Sg
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(Magnetocaloric effect, magnetic cooling)
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75.47.De
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(Giant magnetoresistance)
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81.07.Bc
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(Nanocrystalline materials)
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