Journal
PHYSICAL REVIEW B
Volume 82, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.180514
Keywords
-
Funding
- Institute for Quantum Matter, DOE at JHU [DE-FG02-08ER46544]
- DOE Office of Basic Energy Sciences [DE-FG02-06ER46327]
- NSF [DMR-0084173]
- State of Florida
- AFOSR [FA9550-06-10474]
Ask authors/readers for more resources
We report a study of high quality pnictide superconductor BaFe1.84Co0.16As2 epitaxial thin films using time-domain terahertz (THz) spectroscopy. Near T-c we find evidence for a coherence peak and qualitative agreement with the weak-coupling Mattis-Bardeen form of the conductivity. The real part of the THz conductivity is found to be not fully suppressed at low temperature and sigma(2) is significantly smaller than the Matthis-Bardeen expectation. The temperature dependence of the penetration depth lambda follows a power law with an unusually high exponent of 3.1. We interpret these results as consistent with impurity scattering-induced pair breaking. Taken together our results are strong evidence for an extended s +/- order-parameter symmetry.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available