Anisotropy of electric resistance and upper critical field in magnetic superconductor Dy$_{0.6}$Y$_{0.4}$Rh$_{3.85}$Ru$_{0.15}$B$_4$

A. V. Terekhov; I. V. Zolochevskii; E. V. Khristenko; L. A. Ishchenko; E. V. Bezuglyi; A. Zaleski; E. P. Khlybov; S. A. Lachenkov

doi:10.1016/j.physc.2016.02.024

arXiv · 1507.03247

Anisotropy of electric resistance and upper critical field in magnetic superconductor Dy$_{0.6}$Y$_{0.4}$Rh$_{3.85}$Ru$_{0.15}$B$_4$

A. V. Terekhov·I. V. Zolochevskii·E. V. Khristenko·L. A. Ishchenko·E. V. Bezuglyi·A. Zaleski·E. P. Khlybov·S. A. Lachenkov

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Abstract

We have measured temperature dependencies of the electric resistance $R$ and upper critical magnetic field $H_{c2}$ of a magnetic superconductor Dy$_{0.6}$Y$_{0.4}$Rh$_{3.85}$Ru$_{0.15}$B$_4$. The measurements were made for different angles $\varphi$ of magnetic field inclination to the direction of measuring current and revealed strong anisotropy of the behavior of $R(T)$ and the values of $H_{c2}(T)$. By using the Werthamer-Gelfand-Hohenberg theory, we determined the Maki parameter $\alpha$ and the parameter of the spin-orbital interaction. For $\varphi = 0^\circ$ and $90^\circ$ both parameters are close to zero, thus the magnitude of $H_{c2}(0) \approx 38$ kOe is basically limited by the orbital effect. At $\varphi = 45^\circ$, a large value of the parameter $\alpha = 4.2$ indicates dominating role of the spin-paramagnetic effect in the suppression of $H_{c2}(0)$ down to $8.8$ kOe. We suggest that such behavior of $R(T)$ and $H_{c2}(T)$ is caused by internal magnetism of the Dy atoms which may strongly depend on the magnetic field orientation.

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A. V. Terekhov, I. V. Zolochevskii, E. V. Khristenko, L. A. Ishchenko, E. V. Bezuglyi, A. Zaleski, E. P. Khlybov, S. A. Lachenkov. 2015-07-12. Anisotropy of electric resistance and upper critical field in magnetic superconductor Dy$_{0.6}$Y$_{0.4}$Rh$_{3.85}$Ru$_{0.15}$B$_4$. https://doi.org/10.1016/j.physc.2016.02.024

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