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/

Zendy Plus

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

Zendy Tools

Zendy Open

Andreev reflection spectra have been measured in a new superconductorEuAsFeO0.85F0.15 having an unexpectedly low superconducting transitiontemperature Tc~11.3 K among related FeAs compounds on a base Sm and Gdsurrounding Eu in the series of lanthanides. The nearly fivefold lower Tc, asagainst the expected value, is attributed to the divalent properties of Eu ionswhen in the compound investigated along with the weakly magnetic Eu3+ ions maybe present and the strongly magnetic Eu2+ ones that is a strong destructivefactor for superconductivity. Most of the spectra measured showed features thatcorresponds to two energy gaps whose values varied from contact to contactwithin 2{\Delta}s/kTc=2.2{\pm}4.7 and 2{\Delta}1/kTc=5.1{\pm}11.7 for small andlarge gap, respectively. The corresponding variations for single-gap spectraare 2{\Delta}/kTc = 2.6{\pm}6.4. The relatively large size of crystallites (noless than ~25 \mu{m}) and the large number of contacts measured (several tens)suggest with a high degree of probability that the spectra obtained accountquite fully for the gap distribution practically in all crystallographicdirections. The data obtained and the absence of zero gaps in the measuredspectra evidence in favor of the anisotropic s- or s\pm-symmetry of the orderparameter in EuAsFeO0.85F0.15 that was revealed in other similar compounds withhigher Tc. Thus, the character of the gap function {\Delta}(k) in this compoundis inconsistent with the d-wave superconductivity observed in some low-Tcpnictides.

Andreev reflection spectroscopy of the new Fe-based superconductor EuAsFeO0.85F0.15: evidence for the strong order parameter anisotropy