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Features of Excess Conductivity Behavior in a Magnetic Superconductor Dy$_{0.6}$Y$_{0.4}$Rh$_{3.85}$Ru$_{0.15}$B$_4$ | | A. L. Solovjov
; A. V. Terekhov
; E. V. Petrenko
; L. V. Omelchenko
; Zhang Cuiping
; | | Date: |
15 Jan 2021 | | Abstract: | The temperature dependencies of the excess conductivity $sigma’(T)$ and
possible pseudogap (PG), in a Dy$_{0.6}$Y$_{0.4}$Rh$_{3.85}$Ru$_{0.15}$B$_4$
polycrystal were studied for the first time. It was shown that $sigma’(T)$
near T$_{c}$ is well described by the Aslamazov Larkin fluctuation theory,
demonstrating a crossover with increasing temperature. Using the crossover
temperature $T_0$, the coherence length along the c axis $xi_c(0)$, was
determined. Above the level of $T_{2D}>T_{0}$, an unusual dependence
$sigma’(T)$ was found, which is not described by the fluctuation theories in
the range from $T_{0}$ to $T_{FM}$, at which a ferromagnetic transition occurs.
The range in which superconducting fluctuations exist is apparently quite
narrow and amounts to $Delta T_{fl}=2.8 K$. The resulting temperature
dependence of the PG parameter $Delta^*(T)$ has the form typical of magnetic
superconductors with features at $T_{max}=154 K$ and the temperature of a
possible structural transition at $T_{s}=95 K$. Below $T_{s}$, dependence
$Delta^*{T}$ has a shape typical for PG in cuprates, which suggests that the
PG state can be realized in Dy$_{0.6}$Y$_{0.4}$Rh$_{3.85}$Ru$_{0.15}$B$_4$ in
this temperature range. Comparison of $Delta^*(T)$ with the Peters Bauer
theory made it possible to determine the density of local pairs ~0.35, near
T$_{c}$, which is 1.17 times greater than in optimally doped
YBa$_{2}$Cu$_{3}$O$_{7-delta}$ single crystals. | | Source: | arXiv, 2101.06160 | | Services: | Forum | Review | PDF | Favorites | |
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