Electrical properties and enhanced low-field magnetoresistance of Mn2O3-added La0.7Ca0.3MnO3 ceramics. Issue 22 (15th November 2022)

• Record Type: Journal Article
• Authors: Wang, Haishan; Qi, Longfei; Li, Yule; Li, Junfeng; Zhu, Xiangxiang; Chen, Qingming; Zhang, Hui
• Is Part Of: Ceramics international. Volume 48:Issue 22(2022)
• Page Start: 33984
• Page End: 33991
• Publication Date: 2022-11-15
• Subjects: (La0.7Ca0.3MnO3)1-x: (Mn2O3)x -- Composites -- Electrical properties -- Magnetoresistance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.07.348
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Perovskite La1- x Ca x MnO3 (LCMO) has attracted extensive attention due to its unique physical properties, such as its colossal magnetoresistance, charge ordering, and metal-insulation transition, and its potential applications in optoelectronics, infrared detection, and magnetism sensors. However, the low-field magnetoresistance ( LFMR ) of LCMO requires a low excitation magnetic field, and the actual magnetoresistance ( MR ) at room temperature still does not meet the application requirements. LCMO combined with a second material with different magnetic properties may improve the LFMR . In this study, the LFMR was improved by compounding La0.7 Ca0.3 MnO3 with Mn2 O3 to create (LCMO)1- x : (Mn2 O3 ) x ( x = 0–0.16) composites. The diffusion at the grain boundaries between the two phases changes the Mn 3+ /Mn 4+ ratio, increases the resistivity of the composites, decreases the temperature coefficient of resistivity, and causes the MR to first increase and then decrease. For x = 0.08, MR increases from 52.18% to 56.82% at a relatively low field of 1 T. Such attempts could facilitate the potential applications of the LCMO-based systems.