Journal
PHYSICAL REVIEW B
Volume 83, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.140505
Keywords
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Funding
- National Science Foundation of China
- Chinese Academy of Sciences
- Ministry of Science and Technology of China
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Structural investigations by means of transmission electron microscopy (TEM) on K0.8FexSe2 and KFexSe2, with 1.5 <= x <= 1.8, have revealed a rich variety of microstructure phenomena. Materials with 1.5 <= x <= 1.6 often show a superstructure modulation along the [310] zone-axis direction, and this modulation can be well interpreted by the Fe-vacancy order, which likely yields a superstructure phase of K2Fe4Se5. The superconducting K0.8FexSe2 and KFexSe2 (1.7 <= x <= 1.8) materials contain clear phase separation, in particular, along the c-axis direction, recognizable as visible parallel lamellae in the crystals; this fact suggests that the superconducting phase could have the Fe-vacancy disordered state.
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