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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.

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|August 2, 2024
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Researchers studied superfluid density in Pd-intercalated ErTe_{3} superconductors. They observed a rapid increase below the critical temperature, suggesting quantum and thermal fluctuations influence superconductivity.

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Area of Science:

  • Condensed matter physics
  • Superconductivity research
  • Materials science

Background:

  • Superconductivity and charge-density-wave (CDW) order can coexist in certain materials.
  • Understanding the interplay between these phenomena is crucial for novel electronic applications.
  • Pd-intercalated ErTe_{3} presents a unique system to study this interplay.

Purpose of the Study:

  • To investigate the local superfluid density in Pd-intercalated ErTe_{3} single crystals.
  • To determine the spatial homogeneity of superconductivity below the critical temperature (T_{c}).
  • To analyze the temperature dependence of superfluid density and compare it with theoretical models.

Main Methods:

  • Imaging local superfluid density using sensitive techniques.
  • Measurements performed on single crystals of Pd-intercalated ErTe_{3}.
  • Analysis of data below the superconducting critical temperature (T_{c}) and charge-density-wave onset temperature (T_{CDW}).

Main Results:

  • No detectable inhomogeneities in superfluid density were observed on micron scales.
  • A rapid increase in superfluid density below T_{c} was measured.
  • The observed temperature dependence deviates from conventional Bardeen-Cooper-Schrieffer (BCS) superconductor behavior.

Conclusions:

  • The superfluid density in Pd-intercalated ErTe_{3} is spatially homogeneous.
  • The temperature dependence suggests that quantum and thermal phase fluctuations significantly impact the superconducting state.
  • This finding offers insights into unconventional superconductivity mechanisms.