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

The temperature and magnetic field dependence of the in-plane thermalconductivity $\kappa$ of the iron-arsenide superconductorBa(Fe$_{1-x}$Co$_x$)$_2$As$_2$ was measured down to $T \simeq 50$ mK and up to$H = 15$ T as a function of Co concentration $x$ in the range 0.048 $ \leq x\leq $ 0.114. In zero magnetic field, a negligible residual linear term in$\kappa/T$ as $T \to 0$ at all $x$ shows that there are no zero-energyquasiparticles and hence the superconducting gap has no nodes in the $ab$-planeanywhere in the phase diagram. However, the field dependence of $\kappa$reveals a systematic evolution of the superconducting gap with doping $x$, fromlarge everywhere on the Fermi surface in the underdoped regime, as evidenced bya flat $\kappa (H)$ at $T \to 0$, to strongly $k$-dependent in the overdopedregime, where a small magnetic field can induce a large residual linear term,indicative of a deep minimum in the gap magnitude somewhere on the Fermisurface. This shows that the superconducting gap structure has a strongly$k$-dependent amplitude around the Fermi surface only outside theantiferromagnetic/orthorhombic phase.

physical review letters

Doping dependence of heat transport in the iron-arsenide superconductor  Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$: from isotropic to strongly $k$-dependent gap  structure