@article{oai:kyutech.repo.nii.ac.jp:00005650,
 author = {Soares,  C. C. and ElMassalami,  M. and Yanagisawa,  Y. and Tanaka, Masashi and 田中, 将嗣 and Takeya,  H. and Takano,  Y.},
 journal = {Scientific Reports},
 month = {May},
 note = {It is now well established that the microstructure of Fe-based chalcogenide KxFe2−ySe2 consists of, at least, a minor (~15 percent), nano-sized, superconducting KsFe2Se2 phase and a major (~85 percent) insulating antiferromagnetic K2Fe4Se5 matrix. Other intercalated A1−xFe2−ySe2 (A = Li, Na, Ba, Sr, Ca, Yb, Eu, ammonia, amide, pyridine, ethylenediamine etc.) manifest a similar microstructure. On subjecting each of these systems to a varying control parameter (e.g. heat treatment, concentration x,y, or pressure p), one obtains an exotic normal-state and superconducting phase diagram. With the objective of rationalizing the properties of such a diagram, we envisage a system consisting of nanosized superconducting granules which are embedded within an insulating continuum. Then, based on the standard granular superconductor model, an induced variation in size, distribution, separation and Fe-content of the superconducting granules can be expressed in terms of model parameters (e.g. tunneling conductance, g, Coulomb charging energy, Ec, superconducting gap of single granule, Δ, and Josephson energy J = πΔg/2). We show, with illustration from experiments, that this granular scenario explains satisfactorily the evolution of normal-state and superconducting properties (best visualized on a g - E c/∆ T phase diagram) of AxFe2−ySe2 when any of x, y, p, or heat treatment is varied.},
 title = {Quantum conductance-temperature phase diagram of granular superconductor KxFe2-ySe2},
 volume = {8},
 year = {2018},
 yomi = {タナカ, マサシ}
}