Enhancement of the magnetoresistive property by introducing disorder in the (La1−xYx)0.7Ca0.3MnO3 compound. Issue 27 (15th March 2017)

• Record Type: Journal Article
• Authors: Banik, Sanjib; Das, Kalipada; Das, I.
• Is Part Of: RSC advances. Volume 7:Issue 27(2017)
• Page Start: 16575
• Page End: 16580
• Publication Date: 2017-03-15
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra00744b
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Enhancement of magnetoresistance in the optimal doped (La0.5 Y0.5 )0.7 Ca0.3 MnO3 compound. Abstract : An extraordinarily large magnetoresistance (MR) has been achieved in La0.7 Ca0.3 MnO3 by optimal substitution. To explore the origin of this giant enhancement of MR, we have carried out magnetic and magnetotransport measurements of (La1− x Y x )0.7 Ca0.3 MnO3 ( x = 0, 0.4, 0.5, 0.6, and 1) compounds in detail. Our analysis indicates that the disorder introduced by yttrium substitution plays the crucial role in the magnetoresistive properties in this series. A large MR has been observed in optimally doped (La0.5 Y0.5 )0.7 Ca0.3 MnO3 ( x = 0.5). In this compound, an MR value as high as 1.5 × 10 7 % at a temperature of 50 K and 3.6 × 10 4 % at 80 K has been achieved for an external magnetic field of 90 kOe. Moreover at 80 K, for the x = 0.5 compound, the MR is reversible in nature. The extraordinarily enhanced and large MR value has been described using a phenomenological model of percolation via ferromagnetic clusters.