Unusually large negative magnetoresistance around 200 K in the alloys Gd<sub>1-x</sub>La<sub>x</sub>Mn<sub>2</sub>Ge<sub>2</sub>
- Sampathkumaran, E. V.
- Majumdar, Subham
- Mallik, R.
- Vijayaraghavan, R.
- Wada, H.
- Shiga, M.
DOIAbstract
We report here the observation of large negative Magnetoresistance (MR) at 200 K (for instance, about -5.5% for the application of a magnetic field of 70 kOe) in magnetic alloys, Gd1-xLaxMn2Ge2 (x = 0.07 and 0.08). There is a distinct sign reversal of MR, with a comparable magnitude, for x = 0.07 at 123 K thereby establishing the presence of temperature dependent magnetic structures. The observation of a large MR at temperatures as high as 200 K is uncommon among the bulk form of alloys
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