Origin of the emergence of higher Tc than bulk in iron chalcogenide thin films View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2017-08-30

AUTHORS

Sehun Seo, Jong-Hoon Kang, Myeong Jun Oh, Il-Seok Jeong, Jianyi Jiang, Genda Gu, Jung-Woo Lee, Jongmin Lee, Heesung Noh, Mengchao Liu, Peng Gao, Eric E. Hellstrom, Joo-Hyoung Lee, Youn Jung Jo, Chang-Beom Eom, Sanghan Lee

ABSTRACT

Fabrication of epitaxial FeSexTe1-x thin films using pulsed laser deposition (PLD) enables improving their superconducting transition temperature (T c) by more than ~40% than their bulk T c. Intriguingly, T c enhancement in FeSexTe1-x thin films has been observed on various substrates and with different Se content, x. To date, various mechanisms for T c enhancement have been reported, but they remain controversial in universally explaining the T c improvement in the FeSexTe1-x films. In this report, we demonstrate that the controversies over the mechanism of T c enhancement are due to the abnormal changes in the chalcogen ratio (Se:Te) during the film growth and that the previously reported T c enhancement in FeSe0.5Te0.5 thin films is caused by a remarkable increase of Se content. Although our FeSexTe1-x thin films were fabricated via PLD using a Fe0.94Se0.45Te0.55 target, the precisely measured composition indicates a Se-rich FeSexTe1-x (0.6 < x < 0.8) as ascertained through accurate compositional analysis by both wavelength dispersive spectroscopy (WDS) and Rutherford backscattering spectrometry (RBS). We suggest that the origin of the abnormal composition change is the difference in the thermodynamic properties of ternary FeSexTe1-x, based on first principle calculations. More... »

PAGES

9994

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41598-017-10383-1

DOI

http://dx.doi.org/10.1038/s41598-017-10383-1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1091344592

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/28855591


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52 emergence
53 enhancement
54 epitaxial FeSe
55 fabrication
56 film growth
57 films
58 first-principles calculations
59 growth
60 high Tc
61 improvement
62 increase
63 iron chalcogenide thin films
64 laser deposition
65 mechanism
66 origin
67 principles calculations
68 properties
69 ratio
70 remarkable increase
71 report
72 spectrometry
73 spectroscopy
74 sub
75 substrate
76 target
77 temperature
78 ternary FeSe
79 thermodynamic properties
80 thin films
81 transition temperature
82 wavelength dispersive spectroscopy
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