MAGNETIC AND MAGNETOTRANSPORT PROPERTIES OF La0.7Ca0.3Mn1-x(Zn,Cu)xO3

Authors: ThanhPQ, Phung

Magnetic and magnetotransport properties of two perovskite manganite samples of La0.7Ca0.3Mn0.9Zn0.1O3and La0.7Ca0.3Mn0.95Cu0.05O3prepared by conventional solid-state reaction have been studied in detail. Experimental results revealed that the temperature dependences of magnetization and resistance varied strongly around the phase-transition temperature. Maximum magnetoresistance (MR) values of La0.7Ca0.3Mn0.9Zn0.1O3and La0.7Ca0.3Mn0.95Cu0.05O3under an applied field of 400 Oe were about 21.4 % and 11.0 %, respectively. The maximum magnetic-entropy change (ΔSM) was 2.73 J/kg.K for La0.7Ca0.3Mn0.9Zn0.1O3, and 3.34 J/kg.K for La0.7Ca0.3Mn0.95Cu0.05O3 when the applied field was 45 kOe. Both the MR and ΔSMvalues obtained from two samples were smaller than those of the parent compound La0.7Ca0.3MnO3. This was due to the change in the Mn3+/Mn4+ ratio caused by Zn and Cu dopants, which led to a change in the type of the ferromagneticparamagnetic phase transition…

Title: MAGNETIC AND MAGNETOTRANSPORT PROPERTIES OF La0.7Ca0.3Mn1-x(Zn,Cu)xO3
Authors: ThanhPQ, Phung
Issue Date: 2010-12
Publisher: Himpunan Fisika Indonesia
Series/Report no.: Vol. 10 – No. 2 – Desember 2010;No. 242/Akred-LIPI/P2MBI/05/2010
URI: http://repository.vnu.edu.vn/handle/VNU_123/10096
ISSN: ISSN 0854-3046
Appears in Collections: CRES – Papers
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