English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We have measured the complex dynamical conductivity, $\sigma = \sigma_{1} +i\sigma_{2}$, of superconducting Ba(Fe$_{0.9}$Co$_{0.1}$)$_{2}$As$_{2}$ ($T_{c}= 22$ K) at terahertz frequencies and temperatures 2 - 30 K. In the frequencydependence of $\sigma_{1}$ below $T_{c}$, we observe clear signatures of thesuperconducting energy gap opening. The temperature dependence of $\sigma_{1}$demonstrates a pronounced coherence peak at frequencies below 15 cm$^{-1}$ (1.8meV). The temperature dependence of the penetration depth, calculated from$\sigma_{2}$, shows power-law behavior at the lowest temperatures. Analysis ofthe conductivity data with a two-gap model, gives the smaller isotropic s-wavegap of $\Delta_{A} = 3$ meV, while the larger gap is highly anisotropic withpossible nodes and its rms amplitude is $\Delta_{0} = 8$ meV. Overall, ourresults are consistent with a two-band superconductor with an $s_{\pm}$ gapsymmetry.

Highly anisotropic energy gap in superconducting Ba(Fe$_{0.9}$Co$_{0.1}$)$_{2}$As$_{2}$ from optical conductivity measurements