Single crystal growth and characterization of tetragonal FeSe1−x superconductors

Dmitriy Chareev, Evgeniy Osadchii, Tatiana Kuzmicheva, Jiunn-Yuan Lin, Svetoslav Kuzmichev, Olga Volkova, Alexander Vasiliev
2013 CrysteEngComm  
The plate-like single crystals of tetragonal (P4/nmm) FeSe 12x superconductors were grown using the KCl-AlCl 3 flux technique which produced single crystalline tetragonal samples of about 4 6 4 6 0.1 mm 3 dimensions. The energy dispersive X-ray spectroscopy established a ratio of Fe : Se = 1 : 0.96 ¡ 0.02. The resistivity and magnetization measurements revealed a sharp superconducting transition at T c = 9.4 K. Multiple Andreev reflections spectroscopy pointed to the existence of two-gap
more » ... nductivity with the gap values D L = 2.4 ¡ 0.2 meV and D S = 0.75 ¡ 0.1 meV at 4.2 K. Chernogolovka, Moscow District, Russia b P.N. Lebedev Physical Institute, Russian Academy of Sciences,
doi:10.1039/c2ce26857d fatcat:lyknsxusqfbwpcnmxspzoygo4i