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arXiv · 1003.3314

Systematic Comparison of Eight Substrates in the Growth of FeSe$_{0.5}$Te$_{0.5}$ Superconducting Thin Films

Yoshinori Imai·Takanori Akiike·Masafumi Hanawa·Ichiro Tsukada·Ataru Ichinose·Atsutaka Maeda·Tatsuo Hikage·Takahiko Kawaguchi·Hiroshi Ikuta
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Abstract

We have investigated the crystal structures and superconducting properties of thin films of FeSe$_{0.5}$Te$_{0.5}$ grown on eight different substrates. Superconductivity is not correlated with the lattice mismatch; rather it is correlated with the degree of in-plane orientation and with the lattice parameter ratio $c/a$. The best superconducting properties were observed in films on MgO and LaAlO$_3$ ($T_\mathrm{c}^\mathrm{zero}$ of 9.5 K). TEM observation showed that the presence or absence of an amorphous-like layer at the substrate surface plays a key role in determining the structural and superconducting properties of the grown films.

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Yoshinori Imai, Takanori Akiike, Masafumi Hanawa, Ichiro Tsukada, Ataru Ichinose, Atsutaka Maeda, Tatsuo Hikage, Takahiko Kawaguchi, Hiroshi Ikuta. 2010-03-17. Systematic Comparison of Eight Substrates in the Growth of FeSe$_{0.5}$Te$_{0.5}$ Superconducting Thin Films. https://doi.org/10.1143/apex.3.043102

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