Journal
CHINESE PHYSICS LETTERS
Volume 34, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/34/8/087401
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Funding
- National Natural Science Foundation of China
- Ministry of Science and Technology of China
- Specialized Research Fund for the Doctoral Program of Higher Education [20130002120033]
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We report the successful growth of the tetragonal FeS film with one or two unit-cell (UC) thickness on SrTiO3(001) substrates by molecular beam epitaxy. Large lattice constant mismatch with the substrate leads to high density of defects in single-UC FeS, while it has been significantly reduced in the double-UC thick film due to the lattice relaxation. The scanning tunneling spectra on the surface of the FeS thin film reveal the electronic doping effect of single-UC FeS from the substrate. In addition, at the Fermi level, the energy gaps of approximately 1.5 meV are observed in the films of both thicknesses at 4.6 K and below. The absence of coherence peaks of gap spectra may be related to the preformed Cooper-pairs without phase coherence.
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