Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 48, Issue 38, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/48/38/385104
Keywords
manganites; heterojunction; current-voltage characteristic; series resistance
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Funding
- Zhejiang Provincial Natural Science Foundation [LQ14A040007]
- Natural Science Foundation of China [11447195, 51402275, 11374225, 51271172]
- National Key Project for Basic Research [2014CB921002]
- Research Grant Council of Hong Kong [HKU 702112P]
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The effects of series resistance in heterojunctions composed of La0.5Ca0.5MnO3 (LCMO) and Nb:SrTiO3 with 0.05 wt.% and 0.7 wt.% of Nb doping (0.05NbSTO and 0.7NbSTO) have been investigated in detail using current-voltage curves with and without light illumination. Two linear plots, namely, dV/dlnJ versus J and H(J)[ V-(nk(B)T/q)ln(J/A**T-2)] versus J, have been used to extract the series resistance. These two plots give very close values. The extracted series resistance exhibits a monotonous increase with decreasing temperatures, which could explain the observed anomalous temperature dependence of short circuit current in LCMO/0.7NbSTO.
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