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The First Room-Temperature Ambient-Pressure SuperconductorFor the first time in the world, we succeeded in synthesizing theroom-temperature superconductor ($T_c \ge 400$ K, 127$^\circ$C) working atambient pressure with a modified lead-apatite (LK-99) structure. Thesuperconductivity of LK-99 is proved with the Critical temperature ($T_c$),Zero-resistivity, Critical current ($I_c$), Critical magnetic field ($H_c$),and the Meissner effect. The superconductivity of LK-99 originates from minutestructural distortion by a slight volume shrinkage (0.48 %), not by externalfactors such as temperature and pressure. The shrinkage is caused by Cu$^{2 }$substitution of Pb$^{2 }$(2) ions in the insulating network of Pb(2)-phosphateand it generates the stress. It concurrently transfers to Pb(1) of thecylindrical column resulting in distortion of the cylindrical column interface,which creates superconducting quantum wells (SQWs) in the interface. The heatcapacity results indicated that the new model is suitable for explaining thesuperconductivity of LK-99. The unique structure of LK-99 that allows theminute distorted structure to be maintained in the interfaces is the mostimportant factor that LK-99 maintains and exhibits superconductivity at roomtemperatures and ambient pressure.arxiv.org


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