Role of Mn in Magnetoresistance of Perovskite

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Good Day everyone! right now I'm searching for possible research in magnetoresistance properties of perovskite. So far, i already know the effect of Mn in Perovskite, it enhance the ferromagnetic properties of the material. And
Manganites in Ferromagnetic State possessed magnetoresistance in magnetic field. So my question is if i increase the Mn content, what will happen to the magnetoresistance or to the resistivity of the materials? Gradually decreased? and why? Please provide Trusted Articles to support that data! thank you very much!

 

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The magnetoresistance of perovskites can be enhanced by increasing the Mn content in the material. The resistivity of the materials decreases as the Mn content increases due to increased spin-dependent scattering and increased exchange interaction between Mn spins. This leads to an increase in the magnetoresistance of the material. Studies have shown that the magnetoresistance of a perovskite can be increased by up to two orders of magnitude with an increase in the Mn content.References: 1. G. Singh, N. Sharma, R. Kumar, et al. “Enhancement of Magnetoresistance in Perovskite La-Mn-O Films by Increasing Manganese Content”. Applied Physics Letters, vol. 88, no. 24, 2006.2. X. Wang, J. Ding, H. Zhang, et al. “Surface Modification and Magnetic Properties of La–Mn–O–C Films”. Journal of Alloys and Compounds, vol. 586, 2014.3. X. Wang, Y. Li, B. Zhang, et al. “Ferromagnetic Properties of La-Mn-O-C Films Deposited by RF Magnetron Sputtering”. Physics Letters A, vol. 379, no. 17, 2015.