Anomalous superfluid density in a disordered charge density wave material: Pd-intercalated ErTe${}_3$

Abstract

We image local superfluid density in single crystals of Pd-intercalated ErTe${}_3$ below the superconducting critical temperature, $T_c$, well below the onset temperature, $T_{CDW}$, of (disordered) charge-density-wave order. We find no detectable inhomogeneities. We observe a rapid increase of the superfluid density below $T_c$, deviating from the behavior expected in conventional Bardeen-Cooper-Schrieffer, and show that the temperature dependence is qualitatively consistent with a combination of quantum and thermal phase fluctuations.

arXiv comment15 pages, 12 figures

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