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Superconducting praseodymium superhydrides.

Di Zhou1, Dmitrii V Semenok2, Defang Duan1

  • 1State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.

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|March 12, 2020
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This summary is machine-generated.

Researchers synthesized praseodymium superhydrides (PrH9), discovering new phases and observing superconductivity below 9 K. These findings link magnetism and superconductivity in these complex hydrides.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Superhydrides exhibit complex hydrogenic sublattices, serving as models for metallic hydrogen and high-temperature superconductors.
  • Praseodymium (Pr) compounds are of interest due to magnetism and valence-band f-electrons, suggesting potential for unique superhydride properties.

Purpose of the Study:

  • To synthesize and characterize praseodymium superhydrides (PrH9).
  • To investigate the superconducting properties of PrH9 under pressure.
  • To explore the interplay between magnetism, electronic structure, and superconductivity in Pr-based superhydrides.

Main Methods:

  • Synthesis of PrH9 using laser-heated diamond anvil cells.
  • Synchrotron X-ray diffraction for phase identification.
  • Electrical resistance measurements to detect superconducting transitions.
  • Theoretical calculations to understand magnetic order and superconductivity.

Main Results:

  • Successful synthesis of PrH9, identifying both predicted (F-3m) and novel (P63/mmc) phases.
  • Observation of a potential superconducting transition below 9 K in PrH9.
  • Superconducting transition temperature (Tc) was found to be dependent on applied magnetic fields.
  • Theoretical calculations suggest coexistence of magnetic order and superconductivity.

Conclusions:

  • PrH9 exhibits complex structural phases and potential superconductivity.
  • Magnetism and superconductivity appear to coexist in PrH9 within a specific pressure range.
  • The study highlights the crucial role of hydrogenic sublattices, electronic density of states, and magnetism in Pr-based superhydrides.