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Scanning tunneling microscopic observation of enhanced superconductivity in epitaxial Sn islands grown on SrTiO3 substrate.
- Source :
-
Science Bulletin . Oct2018, Vol. 63 Issue 20, p1332-1337. 6p. - Publication Year :
- 2018
-
Abstract
- Graphical abstract Abstract Recent experimental and theoretical studies of single-layer FeSe film grown on SrTiO 3 have revealed interface enhanced superconductivity, which opens up a pathway to promote the superconducting transition temperature. Here, to investigate the role of SrTiO 3 substrate in epitaxial superconducting film, we grew a conventional superconductor β-Sn (bulk T c ∼ 3.72 K) onto SrTiO 3 substrate by molecular beam epitaxy. By employing scanning tunneling microscope and spectroscopic measurements, an enhanced T c of 8.2 K is found for epitaxial β-Sn islands, deduced by fitting the temperature dependence of the gap values using the BCS formula. The observed interfacial charge injection and enhanced electron–phonon coupling are responsible for this T c enhancement. Moreover, the critical field of 8.3 T exhibits a tremendous increase due to the suppression of the vortex formation. Therefore, the coexistence of enhanced superconductivity and high critical field of Sn islands demonstrates a feasible and effective route to improve the superconductivity by growing the islands of conventional superconductors on perovskite-type titanium oxide substrates. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SUPERCONDUCTING films
*STRONTIUM titanate
*SUPERCONDUCTING transition temperature
Subjects
Details
- Language :
- English
- ISSN :
- 20959273
- Volume :
- 63
- Issue :
- 20
- Database :
- Academic Search Index
- Journal :
- Science Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 133424622
- Full Text :
- https://doi.org/10.1016/j.scib.2018.09.006