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Analysis of superconducting FeSe thin films deposited by a sputtering technique.
- Source :
-
Superconductor Science & Technology . May2013, Vol. 26 Issue 5, p1-7. 7p. - Publication Year :
- 2013
-
Abstract
- Superconducting FeSe thin films have been deposited onto (001)-oriented single-crystalline MgO substrates by conventional radio-frequency magnetron co-sputtering of a FeSe target and a pure Se target. The composition of the films is within the homogeneity range of the tetragonal β phase close to stoichiometry. Films with a minimum residual resistivity and a maximum superconducting transition temperature can be prepared within a narrow substrate temperature range from 480 to 510 °C. In contrast to the equilibrium phase diagram the β phase surprisingly exists in thin films deposited at substrate temperatures as high as 680 °C. The polycrystalline tetragonal films grow with a preferred c-axis texture and a tiny admixture of misaligned grains. The temperature-dependent resistivity reveals a low-temperature linear part and a high-temperature part with a pronounced negative curvature. The origin of the non-Fermi liquid behaviour and the underlying electron scattering mechanisms are still unknown so far. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09532048
- Volume :
- 26
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Superconductor Science & Technology
- Publication Type :
- Academic Journal
- Accession number :
- 86872099
- Full Text :
- https://doi.org/10.1088/0953-2048/26/5/055014