Hydrogen Clathrate Structures in Uranium Hydrides at High Pressures.

Area of Science:

• Condensed matter physics
• Materials science
• Quantum mechanics

Background:

• Room-temperature superconductivity is a long-standing research goal.
• Clathrate metal hydrides are promising candidates for high-temperature superconductors.
• Uranium hydrides offer novel structural possibilities.

Purpose of the Study:

• To investigate the stability and superconducting properties of hydrogen-rich uranium hydride clathrate structures.
• To explore the potential of these materials for achieving superconductivity at higher temperatures.
• To computationally predict the critical temperature (Tc) of novel uranium hydride phases.

Main Methods:

• First-principles calculations were employed to model material structures.
• Density Functional Theory (DFT) was used to determine electronic and structural properties.
• High-pressure conditions were simulated to assess material stability.

Main Results:

• Stable hydrogen-rich clathrate structures of uranium hydrides were identified.
• These structures feature H cages (H24, H29, H32) with uranium atoms at the cage centers.
• A UH10 clathrate structure with H32 cages is predicted to exhibit a critical temperature (Tc) above 77 K at high pressures.

Conclusions:

• Hydrogen-rich uranium clathrates represent a new class of potential high-temperature superconductors.
• The UH10 clathrate structure is a particularly promising material for further experimental investigation.
• High pressure is crucial for stabilizing these superconducting clathrate phases.