  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.
