Crystal growth, transport phenomena and two gap superconductivity in the mixed alkali metal $(K_{1-z}N{a}_z{)}_{x}F{e}_{2-y}S{e}_2$ iron selenide

Maria Roslova, Svetoslav Kuzmichev, Tatiana Kuzmicheva +7

Using the self-flux technique we grew superconducting $(K_{1-z}N{a}_z{)}_{x}F{e}_{2-y}S{e}_2$ (z = 0.3) single crystals. The EDX mapping revealed the uniform elements distribution on the c…