# Using controlled disorder to probe the interplay between charge order and superconductivity in NbSe$_2$

Abstract : The interplay between superconductivity and charge-density wave (CDW) in 2H-NbSe$_2$ is not fully understood despite decades of study. Artificially introduced disorder can tip the delicate balance between two competing long-range orders, and reveal the underlying interactions that give rise to them. Here we introduce disorder by electron irradiation and measure in-plane resistivity, Hall resistivity, X-ray scattering, and London penetration depth. With increasing disorder, the superconducting transition temperature, T$_c$, varies non-monotonically, whereas the CDW transition temperature, T$_{CDW}$, monotonically decreases and becomes unresolvable above a critical irradiation dose where T$_c$ drops sharply. Our results imply that the CDW order initially competes with superconductivity, but eventually assists it. We argue that at the transition where the long-range CDW order disappears, the cooperation with superconductivity is dramatically suppressed. X-ray scattering and Hall resistivity measurements reveal that the short-range CDW survives above the transition. Superconductivity persists to much higher dose levels, consistent with fully gapped superconductivity and moderate interband pairing.
Document type :
Journal articles
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https://hal-cea.archives-ouvertes.fr/cea-01882127
Contributor : Bruno Savelli <>
Submitted on : Wednesday, September 26, 2018 - 3:51:17 PM
Last modification on : Friday, March 5, 2021 - 3:10:18 PM

### Citation

Kyuil Cho, M. Kończykowski, S. Teknowijoyo, A. Tanatar, J. Guss, et al.. Using controlled disorder to probe the interplay between charge order and superconductivity in NbSe$_2$. Nature Communications, Nature Publishing Group, 2018, 9, pp.2796. ⟨10.1038/s41467-018-05153-0⟩. ⟨cea-01882127⟩

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