Electrical and magnetic properties of La0.7Ca0.3Mn0.9Co0.1O3 locating at a threshold of the first- and second-order phase transitions

被引：8

作者：

Tran Dang Thanh ^{[1
,2
]}

Dinh Chi Linh ^{[1
,2
]}

Yen, P. D. H. ^{[3
]}

Tuan, D. A. ^{[4
]}

Zhang, Y. D. ^{[5
]}

The-Long Phan ^{[6
]}

Oh, Suhk Kun ^{[3
]}

Yu, Seong Cho ^{[3
]}

机构：

[1] Vietnam Acad Sci & Technol, Inst Mat Sci, 18 Hoang Quoc Viet, Hanoi, Vietnam

[2] Vietnam Acad Sci & Technol, Grad Univ Sci & Technol, 18 Hoang Quoc Viet, Hanoi, Vietnam

[3] Chungbuk Natl Univ, Dept Phys, Cheongju 28644, South Korea

[4] Univ Ulsan, Dept Phys, Ulsan 680749, South Korea

[5] Baotou Res Inst Rare Earths, Baotou, Inner Mongolia, Peoples R China

[6] Hankuk Univ Foreign Studies, Dept Phys, Yongin 449791, South Korea

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2019年 / 470卷

关键词：

Magnetoresistance; Magnetocaloric effect; Manganites; LA0.67CA0.33MNO3; RESISTIVITY; TRANSPORT;

D O I：

10.1016/j.jmmm.2017.11.113

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, a polycrystalline sample of La0.7Ca0.3Mn0.9Co0.1O3 was prepared by solid-state reaction method. The room-temperature X-ray diffraction analysis using Rietveld refinement technique confirms that the sample has a single-phase state with the orthorhombic structure (space group Pbnm). Based on the temperature dependences of the resistance and magnetization, the magnetoresistance and the magnetocaloric effects of the sample have been investigated. Our results pointed out that La0.7Ca0.3Mn0.9Co0.1O3 compound exhibits the maximum magnetoresistance MR = 100% x [rho(0) x rho(H)]/rho(H) = 14.3% near the metal-semiconductor transition with T-P = 155 K and the maximum magnetic entropy change vertical bar Delta S-max vertical bar = 1.45 J/kg.K around the ferromagnetic-paramagnetic phase transition with T-C = 188 K under an applied magnetic field change Delta H = 4 kOe. Besides, the changes of the specific heat Delta C-P(T, H) for Delta H = 1-4 kOe have been also calculated. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：59 / 63

页数：5

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