Effect of A-site ionic disorder on structure, magnetic and magnetocaloric properties of La0.85-xNdxAg0.15-yKyMnO3 manganites

被引：2

作者：

Fang, Shuohai ^{[1
]}

Chen, Peiqi ^{[1
]}

He, Wei ^{[1
,2
]}

Yu, Xi ^{[1
]}

Yang, Yunxiang ^{[1
]}

Wang, Qian ^{[1
]}

Luo, Hui ^{[1
]}

Yang, Tonghan ^{[1
]}

机构：

[1] Guangxi Univ, Sch Resources Environm & Mat, Key Lab New Proc Nonferrous Met & Mat, Minist Educ, Nanning 530004, Peoples R China

[2] Guangxi Univ, Guangxi Key Lab Proc Nonferrous Met & Featured Mat, Nanning 530004, Peoples R China

来源：

PHYSICA B-CONDENSED MATTER | 2023年 / 670卷

基金：

中国国家自然科学基金;

关键词：

Perovskite manganites; A site cation mismatch; X-ray powder diffraction; Crystal structure; Magnetocaloric effect; Magnetic phase transition; EQUAL-TO-X; CRITICAL-BEHAVIOR; TRANSPORT-PROPERTIES; TRANSITION; PEROVSKITE; PHASE; SUBSTITUTION; SIZE;

D O I：

10.1016/j.physb.2023.415349

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In this paper, the effect of A-site ionic disorder (sigma(2)) on the structure, magnetic and magnetocaloric properties in La0.85-xNdxAg0.15-yKyMnO3 have been investigated. X-ray diffraction analysis using Rietveld refinement shows that the crystal structure of the perovskite manganites changes from rhombohedral (space group R3 (C) over bar) to orthorhombic (space group Pnma) structure with the increasing in sigma(2). Magnetization measurements showed that, upon increasing sigma(2), ferromagnetic double exchange interaction of the perovskite manganites diminishes, and as a result, Curie temperature (T-C) of the samples decrease linearly. The inverse of susceptibility shows a downturn with decreasing temperature before T-C indicating the existence of the Griffiths phase for La0.62Nd0.23-Ag-0.K-099(0).051MnO3 (sigma(2) = 0.004). The magnetic phase transitions of all the samples are belongs to second order transition.

引用

页数：9

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