Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-05-06
Appl. Phys. Lett. 88, 032506 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Replaced with revised version and new figure, 9 pages, 4 figures
Scientific paper
10.1063/1.2166200
The metal-insulator transition temperature in CMR manganites has been altered and brought close to the room temperature by preparing La$_{0.67}$Sr$_{0.33}$MnO$_{3}$ (LSMO)/ Nd$_{0.67}$Sr$_{0.33}$MnO$_{3}$ (NSMO) multilayers with ultra thin individual layers of LSMO and NSMO. The LSMO/NSMO multilayers with ultra thin individual layers of thickness of about $10\AA$ exhibits 150% magnetoresistance at 270 K whereas LSMO/NSMO multilayers with moderate individual layer thickness of about $40\AA$ each exhibits a mere 15% magnetoresistance at the same temperature. We have shown that the reduction in thickness of the individual layers leads to increased spin fluctuation which results in the enhancement of magnetoresistance.
Das Indrajit
Mukhopadhyay Soumik
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