Can any material superconduct at room temperature and ambient pressure?
This text mentions work from 2024 on. Those parts were partly written without a live literature search and have not been checked by an editor yet.
In plain words
The best superconductor at normal pressure works up to about 151 K, roughly minus 120 degrees Celsius; whether any material can reach room temperature without huge pressure is unknown.
Precise statement
Determine whether any thermodynamically stable or long-lived metastable material has $T_c \ge 300\ \mathrm{K}$ at ambient pressure. The ambient-pressure record is 151 K in pressure-quenched HgBa2Ca2Cu3O8+d (2026). An answer is a reproduced zero-resistance and Meissner measurement above 300 K at 1 bar, or a proof that a defined class of realistic materials cannot exceed a stated $T_c$ below 300 K.
What would settle it
Independent replication of resistive and magnetic transitions above 300 K at ambient pressure.
Status in the literature
Unverified note: it names recent work and was partly written without a live literature search; it awaits a check by an editor.
Pressure quench of $\mathrm{HgBa2Ca2Cu3O8}+d$ raised the ambient-pressure record from $133\,\mathrm{K}$ to $151\,\mathrm{K}$ (2026); claims of room-temperature superconductivity in nitrogen-doped lutetium hydride (2023) and LK-99 (2023) were not reproduced.
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