問了GPT， 常壓超導的最高溫度是138K

As of my knowledge cutoff in September 2021, the highest temperature at which superconductivity has been observed at ambient (normal) pressure is in a family of materials called cuprates. The cuprate compound with the highest known transition temperature at ambient pressure is mercury barium calcium copper oxide (HgBa2Ca2Cu3O8+δ), which becomes superconducting below -135 degrees Celsius (138 Kelvin).