Anomalous behaviour of the temperature dependencies of the upper critical fields in (Dy1-xErx)Rh3.8Ru0.2B4 (x=0, 0.2, 0.4)

A. V. Terekhov; A. P. Kazakov; P. M. Fesenko; V. M. Yarovyi; I. V. Zolochevskii; L. O. Ishchenko

doi:10.1063/10.0037033

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arXiv · 2503.07024

Anomalous behaviour of the temperature dependencies of the upper critical fields in (Dy1-xErx)Rh3.8Ru0.2B4 (x=0, 0.2, 0.4)

A. V. Terekhov·A. P. Kazakov·P. M. Fesenko·V. M. Yarovyi·I. V. Zolochevskii·L. O. Ishchenko

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Abstract

For the first time, a detailed analysis of the behaviour of the temperature dependences of the upper critical fields Hc2(T) has been carried out in the compounds (Dy1-xErx)Rh3.8Ru0.2B4 (x = 0, 0.2, 0.4). It is found that the Hc2(T) in (Dy0.8Er0.2)Rh3.8Ru0.2B4 has an inflection point at 3 kOe, which may be related to the low-temperature magnetic ordering, while a more exotic mechanism caused by the transition from ordinary singlet to triplet superconductivity is not excluded. For the first time, the experimental Hc2(T) dependences of (Dy1-xErx)Rh3.8Ru0.2B4 (x = 0, 0.2, 0.4) compounds have been fitted within the framework of Werthamer-Helfand-Hohenberg theory (WHH) with the Maki parameter alpha > 0, indicating that spin-paramagnetic effects due to magnetic exchange interactions play an essential role in suppressing superconductivity in these compounds.

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A. V. Terekhov, A. P. Kazakov, P. M. Fesenko, V. M. Yarovyi, I. V. Zolochevskii, L. O. Ishchenko. 2025-03-10. Anomalous behaviour of the temperature dependencies of the upper critical fields in (Dy1-xErx)Rh3.8Ru0.2B4 (x=0, 0.2, 0.4). https://doi.org/10.1063/10.0037033

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