Article
Sodium influence on the composition, structure and properties of (Na,K,Rb)xFe2-ySe2 ferroselenides
E. O. Rakhmanov
Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russia
e-mail: evgenii.rakhmanov@chemistry.msu.ru
S. Yu. Gavrilkin
Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russia
A. Yu. Levakhova
Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russia
S. A. Kuzmichev
Lebedev Physical Institure of the Russian Academy of Sciences, 119991 Moscow, Russia
Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
I. V. Morozov
Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
A. I. Shilov
Lebedev Physical Institure of the Russian Academy of Sciences, 119991 Moscow, Russia
T. E. Kuzmicheva
Lebedev Physical Institure of the Russian Academy of Sciences, 119991 Moscow, Russia
Abstract
Here we discuss the sodium influence on the iron-based superconductors belonging to the 122-Se family. The Na0.4Rb0.4Fe2Se2, К0.4Rb0.4Fe2Se2, Na0.27K0.27Rb0.27Fe2Se2 samples were grown using self-flux technique. We show that sodium doping results in unusual phase separation, whereas Na0.27K0.27Rb0.27Fe2Se2 exhibits optimal superconducting properties with Tc ≈ 32 K. The crystals were studied using scanning and transmission electron microscopy.
Keywords: Fe-HTSC; ferroselenides; phase separation; crystal growth.
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