Magnetic Properties and Low-Field Magnetoresistance of
Pr0.7 Pb0.3 MnO3 Single Crystals
GU Ben-Xi, ZHANG Shi-Yuan, DU You-Wei
Department of Physics, Nanjing University, Nanjing 210093
Magnetic Properties and Low-Field Magnetoresistance of
Pr0.7 Pb0.3 MnO3 Single Crystals
GU Ben-Xi;ZHANG Shi-Yuan;DU You-Wei
Department of Physics, Nanjing University, Nanjing 210093
关键词 ：
75.30.Cr ,
75.70.Pa ,
75.30.Ds ,
75.50.Dd
Abstract ： The magnetic properties and magnetoresistance of Pr0.7 Pb0.3 MnO3 single crystals have been studied. At low temperature, the temperature dependence of magnetization can be represented as M(T) =M(0)(1-BT3/2 ). A large B value was observed. The spontaneous magnetic moment is slightly larger than the spin-only value for Mn3+ and Mn4+ ions. Above the Curie temperature, the susceptibility obeys the Curie-Weiss Law and the resistivity R can fit well with R0 exp(T0 /T)1/4 . It is found that the effective paramagnetic moment obtained from the Curie constant is larger than the theoretical value. The large effective paramagnetic moment may originate from the magnetic clusters. A large low-field magnetoresistance of Δ R/R(0) = -50% is observed at 230 K in 1T.
Key words ：
75.30.Cr
75.70.Pa
75.30.Ds
75.50.Dd
出版日期: 2001-04-01
引用本文:
GU Ben-Xi;ZHANG Shi-Yuan;DU You-Wei. Magnetic Properties and Low-Field Magnetoresistance of
Pr0.7 Pb0.3 MnO3 Single Crystals[J]. 中国物理快报, 2001, 18(4): 598-600.
0.7 Pb0.3 MnO3 Single Crystals. Chin. Phys. Lett., 2001, 18(4): 598-600.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2001/V18/I4/598
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