Phase-Incoherent Superconducting Pairs in the Normal State of Ba(Fe1−xCox)2As2
Goutam Sheet, Manan Mehta, D. A. Dikin, S. Lee, C. W. Bark, J. Jiang, J. D. Weiss, E. E. Hellstrom, M. S. Rzchowski, C. B. Eom, V. Chandrasekhar
DOI 10.1103/PhysRevLett.105.167003 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
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(Fe0.92Co0.08)2As2 and a silver tip can be seen in the normal state of the film up to temperature T∼1.3Tc, where Tc is the critical temperature of the superconductor. Andreev reflection far above Tc 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe0.92Co0.08)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23.7 | Pressure not reported | midpoint |
Similar papers
Artificial and self-assembled vortex-pinning centers in superconducting Ba(Fe1−xCox)2As2 thin films as a route to obtaining very high critical-current densities
similarity 0.96C. Tarantini et al.
Source status unknown — claims are unverified
Pair-breaking effects and coherence peak in the terahertz conductivity of superconducting BaFe2−2xCo2xAs2 thin films
similarity 0.96R. Valdés Aguilar et al.
Source status unknown — claims are unverified
Ultrafast transient response and electron-phonon coupling in the iron-pnictide superconductor Ba(Fe1−xCox)2As2
similarity 0.96B. Mansart et al.
Source status unknown — claims are unverified
Thermoelectric anisotropy in the iron-based superconductor Ba(Fe1−xCox)2As2
similarity 0.95Marcin Matusiak et al.
Source status unknown — claims are unverified
Highly anisotropic energy gap in superconducting Ba(Fe0.9Co0.1)2As2 from optical conductivity measurements
similarity 0.95T. Fischer et al.
Source status unknown — claims are unverified
Doping evolution of the gap structure and spin-fluctuation pairing in Ba(Fe1−xCox)2As2 superconductors
similarity 0.95A. E. Karakozov et al.
Source status unknown — claims are unverified