Superconductivity and magnetism in FeSe thin films grown by metal–organic chemical vapor deposition
Jun 21,2011|By L Li; Z.R.Yang;Y P Sun, J Y Zhang, D. Z. Shen and Y.H. Zhang. “Superconductivity and magnetism in FeSe thin films grown by metal–organic chemical vapor deposition ” Supercond. Sci. Technol. 24 (2011) 015010
doi:10.1088/0953-2048/24/1/015010
High quality FeSe thin films with different ratios of Fe to Se have been grown on GaAs and Si substrates by changing the flow rate of Fe(CO)5 in a low-pressure metal–organic chemical vapor deposition (MOCVD) system. For both substrates, the films grown at a low flow rate of Fe(CO)5 are non-ferromagnetic and exhibit superconductivity at low temperature, while those grown at a high flow rate of Fe(CO)5 display ferromagnetic and semiconducting behaviors. Our results suggest that the superconducting phase does exist in a narrow range of Fe and Se concentration near stoichiometry. The introduction of excess Fe favors ferromagnetism and leads to the suppression of superconductivity.
