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Protonation enhanced superconductivity in PdTe2.

Zhen Liu1, Tao Han1,2, Mengqin Liu1

  • 1Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 9, 2022
PubMed
Summary
This summary is machine-generated.

Electrochemical ionic liquid gating enhanced superconductivity in palladium telluride (PdTe2) by increasing its transition temperature to 3.2 K. Further improvements were observed over time due to proton diffusion.

Keywords:
electrochemical ionic liquid gatingsuperconductivitytopological superconductor

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Electrochemical ionic liquid gating is a key technique for intercalating ions into layered materials, enabling property modulation.
  • Palladium ditelluride (PdTe2) is a topological superconductor candidate whose properties are sensitive to external stimuli.

Purpose of the Study:

  • To investigate the effect of electrochemical ionic liquid gating on the superconductivity of PdTe2.
  • To explore methods for enhancing the superconducting properties of topological materials.

Main Methods:

  • Electrochemical gating using an ionic liquid to induce protonation in PdTe2 single crystals.
  • Measurement of superconducting transition temperature (SC Tc) and superconducting volume fraction.
  • Post-gating storage of samples in a glove box to observe long-term effects.

Main Results:

  • Superconducting transition temperature of PdTe2 was increased to approximately 3.2 K via room-temperature ionic gating and protonation.
  • A further enhancement in both SC Tc and superconducting volume fraction was observed after 2 months of storage.
  • Evidence suggests proton diffusion within the gated PdTe2 crystals, a rarely reported phenomenon in such experiments.

Conclusions:

  • Electrochemical ionic liquid gating effectively enhances superconductivity in the topological superconductor candidate PdTe2.
  • Proton diffusion may play a significant role in long-term property enhancement after gating, suggesting a common mechanism in electrochemical gating.
  • The findings contribute to the understanding of superconducting mechanisms in PdTe2 and offer insights into electrochemical gating techniques.