The metal - insulator transition and ferromagnetism in the electron-doped layered manganites (x= 0, 0.3, 0.5)

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Abstract
Bulk samples of , with x = 0, 0.3, 0.5, with layered perovskite structure have been synthesized and investigated as regards their electrical, electronic and magnetic properties. It is found that has tetragonal structure and is a metallic ferromagnet with a magnetic transition temperature of 170 K. This compound shows metallic behaviour below 140 K and has a large magnetoresistance (MR) at 100 K at 34 kOe. For x = 0 and 0.3 the structure is monoclinic with a suppression of metallicity. For x = 0 the material is a ferromagnetic insulator. We observed a large increase in the coefficient of the linear term in the specific heat with decreasing x. As far as we are aware, this is the first report of an electron-doped manganite showing a metal - insulator transition and ferromagnetism.
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