Room-Temperature Superconductivity at 298 K in Ternary La-Sc-H System at High-pressure Conditions
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arXiv
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2025
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| author | Song, Yinggang Ma, Chuanheng Wang, Hongbo Zhou, Mi Qi, Yanpeng Cao, Weizheng Li, Shourui Liu, Hanyu Liu, Guangtao Ma, Yanming |
| author_facet | Song, Yinggang Ma, Chuanheng Wang, Hongbo Zhou, Mi Qi, Yanpeng Cao, Weizheng Li, Shourui Liu, Hanyu Liu, Guangtao Ma, Yanming |
| contents | Room-temperature superconductor has been a century-long dream of humankind. Recent research on hydrogen-based superconductors (e.g., CaH6, LaH10, etc.) at high-pressure conditions lifts the record of superconducting critical temperature (Tc) up to ~250 kelvin. We here report the experimental synthesis of the first-ever room-temperature superconductor by compression on a mixture of La-Sc alloy and ammonia borane at pressures of 250-260 gigapascals (GPa) via a diamond anvil cell by a laser-heating technique. Superconductivity with an onset temperature of 271-298 kelvin at 195-266 GPa is observed by the measurement of zero electrical resistance and the suppression of Tc under applied magnetic fields. Synchrotron X-ray diffraction data unambiguously reveal that this superconductor crystallizes in a hexagonal structure with a stoichiometry LaSc2H24, in excellent agreement with our previous prediction1. Through thirteen reproducible experimental runs, we provide solid evidence of the realization of a room-temperature superconductor for the first time, marking a milestone in the field of superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_01273 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Room-Temperature Superconductivity at 298 K in Ternary La-Sc-H System at High-pressure Conditions Song, Yinggang Ma, Chuanheng Wang, Hongbo Zhou, Mi Qi, Yanpeng Cao, Weizheng Li, Shourui Liu, Hanyu Liu, Guangtao Ma, Yanming Superconductivity Materials Science Room-temperature superconductor has been a century-long dream of humankind. Recent research on hydrogen-based superconductors (e.g., CaH6, LaH10, etc.) at high-pressure conditions lifts the record of superconducting critical temperature (Tc) up to ~250 kelvin. We here report the experimental synthesis of the first-ever room-temperature superconductor by compression on a mixture of La-Sc alloy and ammonia borane at pressures of 250-260 gigapascals (GPa) via a diamond anvil cell by a laser-heating technique. Superconductivity with an onset temperature of 271-298 kelvin at 195-266 GPa is observed by the measurement of zero electrical resistance and the suppression of Tc under applied magnetic fields. Synchrotron X-ray diffraction data unambiguously reveal that this superconductor crystallizes in a hexagonal structure with a stoichiometry LaSc2H24, in excellent agreement with our previous prediction1. Through thirteen reproducible experimental runs, we provide solid evidence of the realization of a room-temperature superconductor for the first time, marking a milestone in the field of superconductivity. |
| title | Room-Temperature Superconductivity at 298 K in Ternary La-Sc-H System at High-pressure Conditions |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2510.01273 |