Features of Excess Conductivity Behavior in a Magnetic Superconductor Dy$_{0.6}$Y$_{0.4}$Rh$_{3.85}$Ru$_{0.15}$B$_4$
| Autor: | Solovjov, A. L., Terekhov, A. V., Petrenko, E. V., Omelchenko, L. V., Cuiping, Zhang |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Low Temperature Physics, 45, 1209 2019 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/10.0000132 |
| Popis: | 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. Comment: 10 pages, 7 figures |
| Databáze: | arXiv |
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