Observation of Double-Dome Superconductivity in Potassium-Doped FeSe Thin Films.
Phys Rev Lett
; 116(15): 157001, 2016 04 15.
Article
em En
| MEDLINE
| ID: mdl-27127981
ABSTRACT
We report on the emergence of two disconnected superconducting domes in alkali-metal potassium- (K-)doped FeSe ultrathin films grown on graphitized SiC(0001). The superconductivity exhibits hypersensitivity to K dosage in the lower-T_{c} dome, whereas in the heavily electron-doped higher-T_{c} dome it becomes spatially homogeneous and robust against disorder, supportive of a conventional Cooper-pairing mechanism. Furthermore, the heavily K-doped multilayer FeSe films all reveal a large superconducting gap of â¼14 meV, irrespective of film thickness, verifying the higher-T_{c} superconductivity only in the topmost FeSe layer. The unusual finding of a double-dome superconducting phase is a step towards the mechanistic understanding of superconductivity in FeSe-derived superconductors.
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MEDLINE
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En
Ano de publicação:
2016
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Article