Compressed superhydrides: the road to room temperature superconductivity

Area of Science:

• Materials Science
• Condensed Matter Physics
• Quantum Mechanics

Background:

• Room-temperature superconductivity remains a significant scientific challenge.
• Recent discoveries in high-pressure hydrides (H3S, LaH10) have yielded critical temperatures (Tc) exceeding 200 K.
• A recent study reported superconductivity at 288 K in a carbonaceous sulfur hydride under extreme pressure.

Purpose of the Study:

• To review historical efforts in achieving room-temperature superconductivity with hydrides.
• To summarize key characteristics of high-temperature hydrogen-based superconductors.
• To categorize hydrogen-based superconductors by their structural motifs.

Main Methods:

• Literature review of decades of research on hydrides for superconductivity.
• Analysis of hydrogen structural motifs, bonding, electronic structure, and electron-phonon coupling.
• Classification of superconductors based on hydrogen arrangements (covalent, clathrate, layered, molecular units).

Main Results:

• Significant progress has been made in hydrides, culminating in near room-temperature superconductivity.
• High-temperature hydrogen-based superconductors exhibit diverse structural motifs and bonding characteristics.
• Electron-phonon coupling is a crucial factor in achieving high Tc in these materials.

Conclusions:

• The study provides a comprehensive overview of hydrogen-based superconductors.
• Understanding hydrogen structural motifs is key to designing new high-Tc materials.
• Continued research into hydrides holds promise for realizing practical room-temperature superconductivity.