Suppression of phase separation and giant enhancement of superconducting transition temperature in FeSe(1-x)Te(x) thin films.

@article{Imai2015SuppressionOP,
  title={Suppression of phase separation and giant enhancement of superconducting transition temperature in FeSe(1-x)Te(x) thin films.},
  author={Yoshinori Imai and Yuichi Sawada and Fuyuki Nabeshima and Atsutaka Maeda},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2015},
  volume={112 7},
  pages={1937-40}
}
We demonstrate the successful fabrication on CaF2 substrates of FeSe(1-x)Tex films with 0 ≤ x ≤ 1, including the region of 0.1 ≤ x ≤ 0.4, which is well known to be the "phase-separation region," via pulsed laser deposition that is a thermodynamically nonequilibrium method. In the resulting films, we observe a giant enhancement of the superconducting transition temperature, Tc, in the region of 0.1 ≤ x ≤ 0.4: The maximum value reaches 23 K, which is ∼ 1.5 times as large as the values reported… CONTINUE READING