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Robust nodal behavior in the thermal conductivity of superconducting UTe$_2$ by Hayes, Ian M.; Metz, Tristin E.; Frank, Corey E.; Saha, Shanta R.; Butch, Nicholas P.; Mishra, Vivek; Hirschfeld, Peter J.; Paglione, Johnpierre is a scholarly article available to read on EtoBox.

What is Robust nodal behavior in the thermal conductivity of superconducting UTe$_2$ about?

The superconducting state of the heavy-fermion metal UTe$_2$ has attracted considerable interest because of evidence for spin-triplet Cooper pairing and non-trivial topology. Progress on these questions requires identifying the presence or absence of nodes in the superconducting gap function and their dimension. In this article we report a comprehensive study of the influence of disorder on the thermal transport in the superconducting state of UTe$_2$. Through detailed measurements of the magnetic field dependence of the thermal conductivity in the zero-temperature limit, we obtain clear evidence for the presence of point nodes in the superconducting gap for all samples with transition temperatures ranging from 1.6~K to 2.1~K obtained by different synthesis methods, including a refined self-flux method. This robustness implies the presence of symmetry-imposed nodes throughout the range studied, further confirmed via disorder-dependent calculations of the thermal transport in a model with a single pair of nodes. In addition to capturing the temperature dependence of the thermal conductivity up to $T_c$, this model allows us to limit the possible locations of the nodes, suggesting a

Author

Hayes, Ian M.; Metz, Tristin E.; Frank, Corey E.; Saha, Shanta R.; Butch, Nicholas P.; Mishra, Vivek; Hirschfeld, Peter J.; Paglione, Johnpierre

Published

2024

Language

EN