| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Molecular Beam Epitaxy Growth of Tetragonal FeS Films on SrTiO$_{3}$(001) Substrates |
| Kun Zhao1, Hai-Cheng Lin1, Wan-Tong Huang1, Xiao-Peng Hu1,2, Xi Chen1,2, Qi-Kun Xue1,2, Shuai-Hua Ji1,2** |
1State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084
2Collaborative Innovation Center of Quantum Matter, Beijing 100084
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| Cite this article: |
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Kun Zhao, Hai-Cheng Lin, Wan-Tong Huang et al 2017 Chin. Phys. Lett. 34 087401 |
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Abstract We report the successful growth of the tetragonal FeS film with one or two unit-cell (UC) thickness on SrTiO$_{3}$(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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Received: 11 June 2017
Published: 22 July 2017
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| PACS: |
74.70.Xa
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(Pnictides and chalcogenides)
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68.37.Ef
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(Scanning tunneling microscopy (including chemistry induced with STM))
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73.20.At
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(Surface states, band structure, electron density of states)
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81.15.Hi
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(Molecular, atomic, ion, and chemical beam epitaxy)
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| Fund: Supported by the National Natural Science Foundation of China, the Ministry of Science and Technology of China, and the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No 20130002120033. |
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| [1] | Wang Q Y, Li Z, Zhang W H et al 2012 Chin. Phys. Lett. 29 037402 | | [2] | Ge J F, Liu Z L, Liu C et al 2014 Nat. Mater. 14 285 | | [3] | Hsu F C, Luo J Y, Yeh K W et al 2008 Proc. Natl. Acad. Sci. USA 105 14262 | | [4] | Böhmer A E, Hardy F, Eilers F et al 2013 Phys. Rev. B 87 180505 | | [5] | Song C L, Wang Y L, Cheng P et al 2011 Science 332 1410 | | [6] | Song C L, Wang Y L, Jiang Y P et al 2011 Phys. Rev. B 84 020503(R) | | [7] | He S, He J, Zhang W et al 2013 Nat. Mater. 12 605 | | [8] | Tan S, Zhang Y, Xia M et al 2013 Nat. Mater. 12 634 | | [9] | Liu D, Zhang W, Mou D et al 2012 Nat. Commun. 3 931 | | [10] | Lee J J, Schmitt F T, Moore R G et al 2014 Nature 515 245 | | [11] | Zhang W H, Sun Y, Zhang J S et al 2014 Chin. Phys. Lett. 31 017401 | | [12] | Xiang Y Y, Wang F, Wang D et al 2012 Phys. Rev. B 86 134508 | | [13] | He J, Liu X, Zhang W et al 2014 Proc. Natl. Acad. Sci. USA 111 18501 | | [14] | Liu K, Lu Z Y and Xiang T 2012 Phys. Rev. B 85 235123 | | [15] | Fan Q, Zhang W H, Liu X et al 2015 Nat. Phys. 11 946 | | [16] | Bang J, Li Z, Sun Y Y et al 2013 Phys. Rev. B 87 220503 | | [17] | Sun Y, Zhang W, Xing Y et al 2015 Sci. Rep. 4 6040 | | [18] | Cao H Y, Tan S, Xiang H et al 2014 Phys. Rev. B 89 014501 | | [19] | Zhang W, Li Z, Li F et al 2014 Phys. Rev. B 89 060506 | | [20] | Zheng F, Wang Z, Kang W et al 2013 Sci. Rep. 3 2213 | | [21] | Wang L, Ma X and Xue Q K 2016 Supercond. Sci. Technol. 29 123001 | | [22] | Zhou G, Zhang D, Liu C et al 2016 Appl. Phys. Lett. 108 202603 | | [23] | Peng R, Xu H C, Tan S Y et al 2014 Nat. Commun. 5 5044 | | [24] | Ding H, Lv Y F, Zhao K et al 2016 Phys. Rev. Lett. 117 067001 | | [25] | Rebec S N, Jia T, Zhang C et al 2017 Phys. Rev. Lett. 118 067002 | | [26] | Subedi A, Zhang L, Singh D J et al 2008 Phys. Rev. B 78 134514 | | [27] | Lai X, Zhang H, Wang Y et al 2015 J. Am. Chem. Soc. 137 10148 | | [28] | Xing J, Lin H, Li Y et al 2016 Phys. Rev. B 93 104520 | | [29] | Borg C K H, Zhou X, Eckberg C et al 2016 Phys. Rev. B 93 094522 | | [30] | Ying T P, Lai X F, Hong X C et al 2016 Phys. Rev. B 94 100504(R) | | [31] | Lin H, Li Y, Deng Q et al 2016 Phys. Rev. B 93 144505 | | [32] | Yang X, Du Z, Du G et al 2016 Phys. Rev. B 94 024521 | | [33] | Sacépé B, Dubouchet T, Chapelier C et al 2011 Nat. Phys. 7 239 |
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