Strong Tc dependence for strained epitaxial Ba(Fe1-xCox)2As2 thin films

Iida, K.; Hänisch, J.; Hühne, R.; Kurth, F.; Kidszun, M.; Haindl, S.; Werner, J.; Schultz, L.; Holzapfel, B.
November 2009
Applied Physics Letters;11/9/2009, Vol. 95 Issue 19, p192501
Academic Journal
Ba(Fe1-xCox)2As2 superconducting thin films have been grown on SrTiO3, (La,Sr)(Al,Ta)O3, LaAlO3, and YAlO3 (YAO) single crystal substrates by pulsed laser deposition. All the films, except on YAO, have been grown epitaxially without buffer layers. The films deposited on YAO contained 45° in-plane rotated grains and showed a broad superconducting transition. The onset Tc of the films is observed to increase from 16.2 to 24.5 K with increasing c/a, mainly due to a slight distortion of the AsFe4 tetrahedron. From this correlation, we expect that higher superconducting transition temperatures than 24.5 K in a strained epitaxial film may be possible.


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