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Magnetic Properties and Low-Field Magnetoresistance of
Pr0.7Pb0.3MnO3 Single Crystals |
GU Ben-Xi;ZHANG Shi-Yuan;DU You-Wei |
Department of Physics, Nanjing University, Nanjing 210093
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Cite this article: |
GU Ben-Xi, ZHANG Shi-Yuan, DU You-Wei 2001 Chin. Phys. Lett. 18 598-600 |
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Abstract The magnetic properties and magnetoresistance of Pr0.7Pb0.3MnO3 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.
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Keywords:
75.30.Cr
75.70.Pa
75.30.Ds
75.50.Dd
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Published: 01 April 2001
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