Isotropic Superconductivity in Room-temperature Superconductor LaSc$_{2}$H$_{24}$
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866914232999608320 |
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| author | Wang, Zefang Zhao, Wenbo Ma, Yuan Liu, Hanyu Ma, Yanming |
| author_facet | Wang, Zefang Zhao, Wenbo Ma, Yuan Liu, Hanyu Ma, Yanming |
| contents | The discovery of LaSc$_{2}$H$_{24}$ represents a milestone in the quest for room-temperature superconductivity, yet the microscopic mechanism underlying its superior performance remains unclear. Through a comprehensive revisit of theoretical calculations, we uncover a pivotal transition from the anisotropic two-gap superconductivity of LaH$_{10}$ to the isotropic single-gap superconductivity in LaSc$_{2}$H$_{24}$ upon the introduction of scandium, thereby enhancing the superconducting critical temperature ($T_\mathrm{c}$). This enhancement is rooted in a critical dual role of Sc $3d$ electrons: i) the Sc-derived Jahn-Teller effect promotes hydrogen metallization via the elongation of specific interlayer H-H bonds and enhances electron-phonon coupling (EPC) through the softening of associated phonon modes; ii) Sc $3d$ electrons reconstruct the electronic structure into an MgB$_{2}$-like configuration, generating novel Sc-H-Sc $σ$- and $π$-bonding states with EPC strengths comparable to LaH$_{10}$. Crucially, the pronounced hybridization between Sc and the hydrogen cages effectively unifies these two contributions on the Fermi surface. This Sc-induced gap unification bridges the high-EPC H-H states with widespread Sc-H states, establishing an isotropic single-gap nature with a large overall EPC strength. Our findings identify this Sc-induced gap unification as the fundamental mechanism for achieving room-temperature superconductivity in LaSc$_{2}$H$_{24}$, offering a theoretical blueprint for the future design of superior superconducting hydrides. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_01398 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Isotropic Superconductivity in Room-temperature Superconductor LaSc$_{2}$H$_{24}$ Wang, Zefang Zhao, Wenbo Ma, Yuan Liu, Hanyu Ma, Yanming Superconductivity The discovery of LaSc$_{2}$H$_{24}$ represents a milestone in the quest for room-temperature superconductivity, yet the microscopic mechanism underlying its superior performance remains unclear. Through a comprehensive revisit of theoretical calculations, we uncover a pivotal transition from the anisotropic two-gap superconductivity of LaH$_{10}$ to the isotropic single-gap superconductivity in LaSc$_{2}$H$_{24}$ upon the introduction of scandium, thereby enhancing the superconducting critical temperature ($T_\mathrm{c}$). This enhancement is rooted in a critical dual role of Sc $3d$ electrons: i) the Sc-derived Jahn-Teller effect promotes hydrogen metallization via the elongation of specific interlayer H-H bonds and enhances electron-phonon coupling (EPC) through the softening of associated phonon modes; ii) Sc $3d$ electrons reconstruct the electronic structure into an MgB$_{2}$-like configuration, generating novel Sc-H-Sc $σ$- and $π$-bonding states with EPC strengths comparable to LaH$_{10}$. Crucially, the pronounced hybridization between Sc and the hydrogen cages effectively unifies these two contributions on the Fermi surface. This Sc-induced gap unification bridges the high-EPC H-H states with widespread Sc-H states, establishing an isotropic single-gap nature with a large overall EPC strength. Our findings identify this Sc-induced gap unification as the fundamental mechanism for achieving room-temperature superconductivity in LaSc$_{2}$H$_{24}$, offering a theoretical blueprint for the future design of superior superconducting hydrides. |
| title | Isotropic Superconductivity in Room-temperature Superconductor LaSc$_{2}$H$_{24}$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2601.01398 |