Mesoscopic transport in thin films of La0.67Sr0.33MnO3

Publication date: 1 January 2016
Source:Thin Solid Films, Volume 598
Author(s): I.M. Dildar, D.B. Boltje, M.B.S. Hesselberth, J. Aarts
We investigate thin films of La0.7Sr0.3MnO3 grown on SrTiO3 in which bridges of 100μm long and 1μm or 300nm wide (distance between voltage contacts was 25μm) were defined lithographically. In bridges of 1μm, we find the current–voltage characteristics to be perfectly linear (ohmic) over the full temperature range between 400K and 10K. Strong non-linearities however are observed for a 300nm wide bridge in the temperature regime below the transition temperature. The non-linearities are present even when applying a high magnetic field of 9T.