Journal
APPLIED PHYSICS LETTERS
Volume 99, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3656703
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Funding
- National Research Foundation (NRF) Singapore [NRF2008NRF-CRP002-024]
- National University of Singapore (NUS)
- FRC
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Two anomalous bias dependent resistive peaks induced by the SrTiO3 structural phase transitions at 55 and 110 K were observed in a LaAlO3/SrTiO3 and Nb:SrTiO3 rectifying junction when the LaAlO3/SrTiO3 was depleted under reverse bias. At these transition temperatures, the barrier between LaAlO3/SrTiO3 and Nb:SrTiO3 showed abrupt changes in the tunneling energy under forward bias. The peak at 110 K was an insulator-metal phase transition while the peak at 55 K was a metal-insulator one. We propose that the phase transitions of the SrTiO3 substrate influence the charge transfer to the LaAlO3/SrTiO3 layer, giving rise to these anomalous resistive peaks. (C) 2011 American Institute of Physics. [doi:10.1063/1.3656703]
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