Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1651447 | Materials Letters | 2007 | 4 Pages |
Abstract
The special formula of La2/3+ySr1/3âyMn1âyCryO3 with [Mn3+]/([Mn4+]Â +Â [Cr3+]) ratio fixed at optimal proportion 2:1 was designed to tune colossal magnetoresistance (CMR) response around room temperature and test the possibility of ferromagnetic (FM) interaction of hetero-ionic coupling between Mn3+ and Cr3+. The polycrystalline bulk samples were fabricated by the traditional solid-state reaction method. The structural, magnetic, electrical transports and magnetoresistance (MR) properties were investigated. An enhancement of CMR at room temperature with appropriate content y has been observed, meanwhile, substituting Cr for Mn in manganites shows inefficiency in lowering ferromagnetic-paramagnetic (FM-PM) transition temperature Tc and metal-insulator (M-I) transition temperature Tp. Experimental results indicate that there might exist a FM coupling between Mn3+ and Cr3+.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Xun Xiao, Songliu Yuan, Juhong Miao, Guangming Ren, Gongqi Yu, Yongqiang Wang, Shiyan Yin,