Phase-incoherent superconducting pairs in the normal state of Ba(FeCo)As
arXiv:1004.4852 · doi:10.1103/PhysRevLett.105.167003
Abstract
The normal state properties of the recently discovered ferropnictide superconductors might hold the key to understanding their exotic superconductivity. Using point-contact spectroscopy we show that Andreev reflection between an epitaxial thin film of Ba(FeCo)As and a silver tip can be seen in the normal state of the film up to temperature , where is the critical temperature of the superconductor. Andreev reflection far above can be understood only when superconducting pairs arising from strong fluctuation of the phase of the complex superconducting order parameter exist in the normal state. Our results provide spectroscopic evidence of phase-incoherent superconducting pairs in the normal state of the ferropnictide superconductors.
arXiv comment4 pages including 3 figures
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- Thin Film Growth and Device Fabrication of Iron-Based Superconductors
- Pseudogap in underdoped BaKFeAs as seen via optical conductivity
- BCS-like critical fluctuations with limited overlap of Cooper pairs in FeSe
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- Doubling of the critical temperature of FeSe observed in point contacts
- Doping and critical-temperature dependence of the energy gaps in Ba(Fe_{1-x}Co_x)_2As_2 thin films
- Point contact spectroscopy in Fe-based superconductors: recent advancements and future challenges
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