Irreversible metamagnetic behaviors and H-T phase diagram in phase separated La0.5Ca0.5Mn1-xAlxO3-δ

被引：2

作者：

Shang, C. ^{[1
]}

Xia, Z. C. ^{[2
]}

Dai, H. Y. ^{[1
]}

Wang, Y. Q. ^{[1
]}

Liu, D. W. ^{[1
]}

机构：

[1] Zhengzhou Univ Light Ind, Sch Phys & Elect Engn, Henan Key Lab Magnetoelectron Informat Funct Mat, Zhengzhou 450002, Peoples R China

[2] Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Wuhan 430074, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2023年 / 49卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Charge ordering; Doping; Phase separation; Metamagnetic transition; FERROMAGNETIC PHASE; MAGNETIC-FIELD; OXYGEN-CONTENT; CHARGE; TRANSITION; MAGNETORESISTANCE; TRANSPORT; LA1-XCAXMNO3; TEMPERATURE; RELAXATION;

D O I：

10.1016/j.ceramint.2022.11.019

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Magnetization relaxation, ac susceptibility, dc magnetization and magnetoelectrical transport measurements have been carried out on Al3+-doped manganites La0.5Ca0.5Mn1-xAlxO3-delta (x = 0.05, 0.07, 0.09, 0.10, 0.15). Experimental results suggest that nonmagnetic Al3+ substituting Mn suppresses the ferromagnetic phase and induces a charge ordered antiferromagnetic phase. The coexistence and competition of these two kinds of in-teractions result in a spin-glass like state in x = 0.1 and 0.15 system. Obvious hysteresis was observed in both magnetization and resistivity versus temperature and magnetic field curves, suggesting an inhomogeneous metastable phase transition. Upon applying a magnetic field of HCA-F, the Al3+-doped samples undergo an irre-versible metamagnetic transition from the charge ordering antiferromagnetic insulating to ferromagnetic metallic phase in the low temperature region. Phase diagram in the HC -T plane has been determined according to the magnetization and magnetoelectric transport measurements. The magnetic disorders and antiferromagnetic matrix produced by Al3+ dopants and spontaneous oxygen vacancies play an important role in the pinning of the FM phase.

引用

页码：8743 / 8753

页数：11

共 35 条

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