Phase-separation control of K$_x$Fe$_{2-y}$Se$_2$ superconductor through rapid-quenching process

Yusuke Yanagisawa; Masashi Tanaka; Aichi Yamashita; Kouji Suzuki; Hiroshi Hara; Mohammed ElMassalami; Hiroyuki Takeya; Yoshihiko Takano

doi:10.7566/JPSJ.86.043703

paper

Phase-separation control of K $_{x}$ Fe $_{2 - y}$ Se $_{2}$ superconductor through rapid-quenching process

arXiv:1701.04911 · doi:10.7566/JPSJ.86.043703

Abstract

K $_{x}$ Fe $_{2 - y}$ Se $_{2}$ exhibits an iron-vacancy ordering at $T_{s} \sim 270°$ C and separates into two phases: a minor superconducting (iron-vacancy-disordered) phase and a major non-superconducting (iron-vacancy-ordered) phase. The microstructural and superconducting properties of this intermixture can be tuned by an appropriate control of the quenching process through $T_{s}$ . A faster quenching rate leads to a finer microstructure and a suppression of formation of the non-superconducting phase by up to 50%. Nevertheless, such a faster cooling rate does induce a monotonic reduction in the superconducting transition temperature (from 30.7 K down to 26.0 K) and, simultaneously, a decrease in the iron content within the superconducting phase such that the compositional ratio changed from K $_{0.35}$ Fe $_{1.83}$ Se $_{2}$ to K $_{0.58}$ Fe $_{1.71}$ Se $_{2}$ .

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Quenching Dependence on Superconductivity in the Synthesizing Process of Single Crystals of Rb $_{x}$ Fe $_{2 - y}$ Se $_{2}$

Phase-separation control of Kx​Fe2−y​Se2​ superconductor through rapid-quenching process

Abstract

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Phase-separation control of K $_{x}$ Fe $_{2 - y}$ Se $_{2}$ superconductor through rapid-quenching process