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

doi:10.1063/10.0000132

paper

Features of Excess Conductivity Behavior in a Magnetic Superconductor Dy $_{0.6}$ Y $_{0.4}$ Rh $_{3.85}$ Ru $_{0.15}$ B $_{4}$

arXiv:2101.06160 · doi:10.1063/10.0000132

Abstract

The temperature dependencies of the excess conductivity $σ^{'} (T)$ 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 $σ^{'} (T)$ 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 $ξ_{c} (0)$ , was determined. Above the level of $T_{2 D} > T_{0}$ , an unusual dependence $σ^{'} (T)$ was found, which is not described by the fluctuation theories in the range from $T_{0}$ to $T_{F M}$ , at which a ferromagnetic transition occurs. The range in which superconducting fluctuations exist is apparently quite narrow and amounts to $Δ T_{f l} = 2.8 K$ . The resulting temperature dependence of the PG parameter $Δ^{*} (T)$ has the form typical of magnetic superconductors with features at $T_{ma x} = 154 K$ and the temperature of a possible structural transition at $T_{s} = 95 K$ . Below $T_{s}$ , dependence $Δ^{*} T$ 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 $Δ^{*} (T)$ 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 $_{7 - δ}$ single crystals.

arXiv comment10 pages, 7 figures

Features of Excess Conductivity Behavior in a Magnetic Superconductor Dy0.6​Y0.4​Rh3.85​Ru0.15​B4​

Abstract

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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 $_{4}$