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In Situ High Pressure Hydrogen Tribological Testing of Common Polymer Materials Used in the Hydrogen Delivery Infrastructure
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General trend for pressurized superconducting hydrogen-dense materials.

Duck Young Kim1, Ralph H Scheicher, Ho-kwang Mao

  • 1Condensed Matter Theory Group, Department of Physics and Materials Science, Uppsala University, Box 530 SE-751 21, Uppsala, Sweden.

Proceedings of the National Academy of Sciences of the United States of America
|February 6, 2010
PubMed
Summary

Metallic hydrogen, a predicted high-temperature superconductor, is challenging to synthesize. This study explores metal hydrides (ScH3, YH3, LaH3) as proxies, predicting their superconducting critical temperature (Tc) dependence on pressure (P).

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Metallic hydrogen is predicted to be a high-temperature superconductor, but experimental realization is hindered by extreme pressure requirements.
  • Hydrogen-dense materials like metal hydrides (MH3 and MH4) offer a viable alternative for studying metallic hydrogen properties under achievable pressures.
  • Previous studies suggest superconductivity in some hydrides, but a systematic pressure dependence of the superconducting critical temperature (Tc) remains unidentified.

Purpose of the Study:

  • To computationally predict the superconducting critical temperature (Tc) as a function of pressure (P) for ScH3, YH3, and LaH3.
  • To identify trends in the Tc-P relationship for MH3-type metal hydrides.
  • To guide future theoretical and experimental investigations into high-temperature superconductivity in hydrogen-dense materials.

Main Methods:

  • First-principles calculations were employed to model the electronic and vibrational properties of the metal hydrides.
  • The Allen-Dynes formula was used to estimate the superconducting critical temperature (Tc) based on calculated parameters.
  • Systematic variation of applied pressure (P) was performed to analyze the Tc dependence.

Main Results:

  • Predicted superconducting critical temperatures (Tc) for ScH3, YH3, and LaH3 were calculated as a function of applied pressure (P).
  • A general trend in the dependence of Tc on P was identified across the studied MH3 systems.
  • The results provide quantitative predictions for Tc under pressure for these specific metal hydrides.

Conclusions:

  • The study establishes a relationship between pressure and superconducting critical temperature in ScH3, YH3, and LaH3.
  • The findings support the use of metal hydrides as proxies for studying metallic hydrogen and high-temperature superconductivity.
  • This work is expected to stimulate further research into the theoretical and experimental exploration of superconductivity in hydrogen-rich materials.