Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3370355
Keywords
iron alloys; magnetic fields; niobium; Schottky barriers; selenium alloys; semiconductor-metal boundaries; strontium compounds; substrates; superconducting energy gap; superconducting materials; tellurium alloys
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Funding
- National Science Council, Taiwan [96-2112-M-001-026-MY3]
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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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