Heterojunction of Fe(Se1-xTex) superconductor on Nb-doped SrTiO3

Wu, C. T.; Chang, H. H.; Luo, J. Y.; Chen, T. J.; Hsu, F. C.; Chen, T. K.; Wang, M. J.; Wu, M. K.
March 2010
Applied Physics Letters;3/22/2010, Vol. 96 Issue 12, p122506
Academic Journal
We report the fabrication of heterojunctions formed by the FeSe0.5Te0.5 (FeSeTe) superconductor and Nb-doped SrTiO3 semiconducting substrate and their properties. At high temperature when FeSeTe is in its normal state, the forward bias I-V curves behave like a metal-semiconductor junction with a low Schottky barrier. Direct tunneling through the thin depletion layer of the junction dominates the reverse bias I-V curves. When FeSeTe film becomes superconducting at low temperature, we observed that the Schottky barrier height of the junction increased but was suppressed by an external magnetic field. This deviation provides an estimate of the superconducting energy gap of the FeSeTe film.


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