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Anomalous Superfluid Density in a Disordered Charge-Density-Wave Material: Pd-Intercalated ErTe_{3}
Yusuke Iguchi1,2,3, Joshua A Straquadine2,3, Chaitanya Murthy4
1Stanford Institute for Materials and Energy Sciences, <a href="https://ror.org/05gzmn429">SLAC National Accelerator Laboratory</a>, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
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 on micron scales. We observe a rapid increase of the superfluid density below T_{c}, deviating from the behavior expected in a conventional Bardeen-Cooper-Schrieffer superconductor, and show that the temperature dependence is qualitatively consistent with a combination of quantum and thermal phase fluctuations.
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