1National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093
2Department of Physics, Heibei Normal University, Shijiazhuang 050091
Magnetic and Transport Properties of Oxygen-Deficient Perovskite Manganites
1National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093
2Department of Physics, Heibei Normal University, Shijiazhuang 050091
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.
ZHONG Wei;JIANG Hong-Ying;WU Xiao-Ling;TANG Nu-Jiang;CHEN Wei;DU You-Wei. Magnetic and Transport Properties of Oxygen-Deficient Perovskite Manganites[J]. 中国物理快报, 2003, 20(5): 742-745.
ZHONG Wei, JIANG Hong-Ying, WU Xiao-Ling, TANG Nu-Jiang, CHEN Wei, DU You-Wei. Magnetic and Transport Properties of Oxygen-Deficient Perovskite Manganites. Chin. Phys. Lett., 2003, 20(5): 742-745.
2003, Vol. 20 
