Research Progress on High-Temperature H<sub>2</sub>-Molecular-Type Hydride under High Pressure

WEI Xinmiao; LIU Zhao; CUI Tian

doi:10.11858/gywlxb.20251257

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Chinese Journal of High Pressure Physics > 2026 > Corrected proof

WEI Xinmiao, LIU Zhao, CUI Tian. Research Progress on High-Temperature H2-Molecular-Type Hydride under High Pressure[J]. Chinese Journal of High Pressure Physics. doi: 10.11858/gywlxb.20251257

Citation:

WEI Xinmiao, LIU Zhao, CUI Tian. Research Progress on High-Temperature H₂-Molecular-Type Hydride under High Pressure[J]. Chinese Journal of High Pressure Physics. doi: 10.11858/gywlxb.20251257

WEI Xinmiao, LIU Zhao, CUI Tian. Research Progress on High-Temperature H2-Molecular-Type Hydride under High Pressure[J]. Chinese Journal of High Pressure Physics. doi: 10.11858/gywlxb.20251257

Citation:

WEI Xinmiao, LIU Zhao, CUI Tian. Research Progress on High-Temperature H₂-Molecular-Type Hydride under High Pressure[J]. Chinese Journal of High Pressure Physics. doi: 10.11858/gywlxb.20251257

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Research Progress on High-Temperature H₂-Molecular-Type Hydride under High Pressure

doi: 10.11858/gywlxb.20251257

WEI Xinmiao^1
,,
LIU Zhao^{1,*
,
,},
CUI Tian^{1, 2,*
,
,}

1.
Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, Zhejiang, China
2.
College of Physics, Jilin University, Changchun 130012, Jilin, China

Received Date: 11 Nov 2025
Rev Recd Date: 08 Dec 2025

Available Online: 10 Dec 2025

Abstract

Abstract

The synthesis of the room-temperature superconductor LaSc₂H₂₄ represents a significant milestone in the field of superconductivity research. A central goal of subsequent studies is to lower the stabilization pressure required for hydrogen-rich superconductors, thereby establishing both theoretical foundation and technical pathway toward achieving low-pressure room-temperature superconductivity. This paper reviews recent advances in the prediction and experimental synthesis of hydride materials, with a focus on a promising strategy for realizing high-temperature superconductivity at reduced pressures—namely, H₂-molecular-typehydride. The superconducting mechanism dominated by molecular H₂ units is redefined, offering a new perspective for understanding phonon-mediated superconductivity. In H₂-molecular-type hydrides, a nearly free-electron gas behavior has been clearly observed. These delocalized electrons exhibit metallic bonding characteristics while retaining fragments of molecular hydrogen. This finding indicates that the essential condition for superconducting transition is the formation of a Fermi sea hosting Cooper pairs, rather than complete dissociation into atomic hydrogen. The generation mechanism of the free-electron gas in these materials can be effectively explained using a finite potential well model. The distinctive electronic properties of these compounds under high pressure, combined with enhanced electron-phonon coupling, establish a novel paradigm for designing low-pressure, high-temperature, and potentially room-temperature superconductors.
- high pressure,
- hydrogen molecular hydrides,
- electron-phonon coupling,
- high-temperature superconductivity

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References(57)

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Research Progress on High-Temperature H₂-Molecular-Type Hydride under High Pressure

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