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Fluctuation conductivity and possible pseudogap state in FeAs-based superconductor EuFeAsO(0.85)F(0.15) | | A. L. Solovjov
; L. V. Omelchenko
; A. V.Terekhov
; E.P. Khlybov
; K. Rogacki
; | | Date: |
9 Jun 2015 | | Abstract: | The study of excess conductivity $sigma’(T)$ in the textured polycrystalline
FeAs-based superconductor $EuFeAsO_{0.85}F_{0.15}$ ($T_c = 11, K$) prepared by
the solid state synthesis is reported. The $sigma’(T)$ analysis has been
performed within the Local Pair (LP) model based on the assumption of the LP
formation in cuprate high-$T_c$ superconductors (cuprates) below the pseudogap
(PG) temperature $T^*gg T_c$. Similarly to the cuprates, near $T_c$
$sigma’(T)$ is adequately described by the 3D term of the Aslamasov-Larkin
(AL) theory but the range of the 3D-AL fluctuations, $Delta T_{3D}$, is
relatively short. Above the crossover temperature $T_0 approx 11.7,K$
$sigma’(T)$ is described by the 2D Maki-Thompson (MT) fluctuation term of the
Hikami-Larkin (HL) theory. But enhanced 2D-MT fluctuation contribution, being
typical for the magnetic superconductors, is observed. Within the LP model
approach the PG parameter, $Delta^*(T)$, was determined for the first time.
$Delta^*(T)$ shows the narrow maximum at $T_s approx 160,K$ followed by the
linear drop down to $T_{SDW}=T_{NFe}approx 133,K$. Both small $Delta T_{3D}$
and enhanced $sigma’(T)$, including linear $Delta^*(T)$ drop, are considered
to be the evidence of the enhanced magnetic interaction in
$EuFeAsO_{0.85}F_{0.15}$. Importantly, the slop of the linear $Delta^*(T)$ and
its length are found to be the same as observed for $SmFeAsO_{0.85}$. The
results suggest both the similarity of magnetic interaction processes in
different Fe-pnictides and applicability of the LP model approach to the
$sigma’(T)$ analysis even in magnetic superconductors. | | Source: | arXiv, 1506.2875 | | Services: | Forum | Review | PDF | Favorites | |
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