Spin dynamics, electrical and magnetic properties of (La0.5Pr0.5)(0.7)Pb0.3Mn1-xCuxO3 (x=0, 0.02) perovskites

T.L. Phan
N.D. Tho
M.H. Phan
N.D. Ha
N. Chau
S.C. Yu

Magnetization, resistivity, and electron spin resonance (ESR) measurements were carried out to investigate spin dynamics, electrical and magnetic properties of (La0.5Pr0.5)(0.7)Pb0.3Mn1-xCuxO3 (x = 0, 0.02) perovskites. It was found that with Cu addition the Curie temperature decreased from 326 K for x = 0 to 300 K for x = 0.02 composition. The x = 0 sample underwent a metallic-insulator transition at similar to 130 K, whereas the x = 0.02 sample with higher resistivity exhibited ail insulating behavior as a whole. It was furthermore found that asymmetrical ESR signals at low temperatures became Lorentzian at high temperatures above T-min. The temperature dependence of the linewidth, Delta H(T), at T > T-min fits well to the one-phonon model, Delta H(T) = AT + B. The activation energy E, determined from the ESR intensity with respect to temperature, are 0.16 and 0.14 eV for x = 0 and 0.02 compositions, respectively. In terms of our experimental results, it is reasonable to conclude that the Cu addition led to a suppression of the ferromagnetism and conductivity of the parent compound (x = 0).

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Title:	Spin dynamics, electrical and magnetic properties of (La0.5Pr0.5)(0.7)Pb0.3Mn1-xCuxO3 (x=0, 0.02) perovskites
Authors:	T.L. Phan N.D. Tho M.H. Phan N.D. Ha N. Chau S.C. Yu
Keywords:	perovskite manganites;magnetic and electrical properties;ESR
Issue Date:	2006
Publisher:	ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Citation:	ISIKNOWLEDGE

Description:	PHYSICA B-CONDENSED MATTER Volume: 371 Issue: 2 Pages: 317-322 Published: JAN 31 2006 ; TNS07719
URI:	http://www.sciencedirect.com/science/article/pii/S0921452605011683 http://repository.vnu.edu.vn/handle/VNU_123/31994
ISSN:	0921-4526
Appears in Collections:	Bài báo của ĐHQGHN trong Web of Science