Magnetic Properties and Low-Field Magnetoresistance of
Pr0.7Pb0.3MnO3 Single Crystals

Chin. Phys. Lett.

2001, Vol. 18

Issue (4): 598-600 DOI:

Original Articles

Magnetic Properties and Low-Field Magnetoresistance of Pr_0.7Pb_0.3MnO₃ Single Crystals

GU Ben-Xi;ZHANG Shi-Yuan;DU You-Wei

Department of Physics, Nanjing University, Nanjing 210093

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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 Pr_0.7Pb_0.3MnO₃ single crystals have been studied. At low temperature, the temperature dependence of magnetization can be represented as M(T) =M(0)(1-BT^3/2). 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.

Keywords: 75.30.Cr 75.70.Pa 75.30.Ds 75.50.Dd

Published: 01 April 2001

PACS:	75.30.Cr	(Saturation moments and magnetic susceptibilities)
	75.70.Pa
	75.30.Ds	(Spin waves)
	75.50.Dd	(Nonmetallic ferromagnetic materials)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2001/V18/I4/0598

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