Thermally activated recovery of electrical conductivity in LaAlO3/SrTiO3

Abstract

Patterned structures of LaAlO3/SrTiO3 that exhibit a decrease in their electrical conductivity below 30 K, recover their higher conductivity upon warming in a thermally activated process. Two dominant energy barriers Eb are identified: Eb1=0.2240.003 eV related to conductivity recovery near 70 K and Eb2=0.440.015 eV related to conductivity recovery near 160 K. We discuss possible linkage to structural defects such as dislocations and twin boundaries.

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