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Molecular Beam Epitaxy Growth of Tetragonal FeS Film on SrTiO3(001) Substrate
ZHAO Kun 1,LIN Haicheng 2,HUANG Wantong 2,HU Xiaopeng 2,CHEN Xi 2,Xue Qi-Kun 2,JI Shuai-Hua 2 * #
1.Department of Physics, Tsinghua University, Beijing 100084;Department of Physics, Tsinghua University, Beijing 100084;Department of Physics, Tsinghua University, Beijing 100084;Department of Physics, Tsinghua University, Beijing 100084;Department of Physics, Tsinghua University, Beijing 100084;Department of Physics, Tsinghua University, Beijing 100084;Department of Physics, Tsinghua University, Beijing 100084
2.
*Correspondence author
#Submitted by
Subject:
Funding: Ministry of Science and Technology of China (No.2013CB934600), Specialized Research Fund for the Doctoral Program of Higher Education (No.20130002120033), National Science Foundation of China (No.11574175)
Opened online:31 May 2017
Accepted by: none
Citation: ZHAO Kun,LIN Haicheng,HUANG Wantong.Molecular Beam Epitaxy Growth of Tetragonal FeS Film on SrTiO3(001) Substrate[OL]. [31 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4735042
 
 
We report the successful growth of tetragonal FeS film with one or two unit cell (UC) thickness on SrTiO3(001) substrate 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 double UC thick film due to the lattice relaxation. The scanning tunneling spectra on the surface of 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 approximate 1.5 meV are observed in films of both thickness 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.
Keywords:molecular beam epitaxy; iron-based superconductor; FeS
 
 
 

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