|Title||Formation mechanism of superconducting phase and its three-dimensional architecture in pseudo-single-crystal KxFe2-ySe2|
|Publication Type||Journal Article|
|Year of Publication||2016|
|Authors||Liu, Y, Xing, QF, Straszheim, WE, Marshman, J, Pedersen, P, McLaughlin, R, Lograsso, TA|
|Journal||Physical Review B|
|Type of Article||Article|
order-disorder transition. It should be emphasized that the phase separation in pseudo-single-crystal KxFe2-ySe2 is caused by the iron-vacancy order-disorder transition. The shrinkage of the high-temperature phase and the expansion of the newly created iron-vacancy-ordered phase during the phase separation rule out the mechanism of spinodal decomposition proposed in an early report [Z. Wang et al., Phys. Rev. B 91, 064513 (2015)]. Since the formation of the superconducting phase relies on the occurrence of the iron-vacancy order-disorder transition, it is impossible to synthesize a pure superconducting phase by a conventional solid state reaction ormelt growth. By focused ion beam scanning electronmicroscopy, we further demonstrate that the superconducting phase forms a contiguous three-dimensional architecture composed of parallelepipeds that have a coherent orientation relationship with the iron-vacancy-ordered phase.
|Custom 1|| |