High-temperature superconductors are defined as those with a critical temperature above 77 K (-196.15 °C).

La2-xSrxCuO4, discovered in 1986, was the first material found to exhibit high-temperature superconductivity.

As of 2023, the highest critical temperature achieved by a high-temperature superconductor is 138 K (-135 °C), set by the compound HgBa2Ca2Cu3O8+x.

In high-temperature superconductors, electron-mediated pairing is believed to be the dominant mechanism responsible for superconductivity.

High-temperature superconductors have potential applications in power transmission, medical imaging, particle accelerators, and other areas.

The main challenges in developing practical high-temperature superconductors include high cost, brittleness, and low critical current density.

The United States, Japan, and China have all made significant contributions to the research and development of high-temperature superconductors.

High-temperature superconductors have the potential to revolutionize various technologies, leading to more efficient power transmission, faster computers, improved medical imaging, and other advancements.

Major research directions in the field of high-temperature superconductivity include searching for new materials with higher critical temperatures, improving the critical current density of existing materials, and developing new fabrication techniques.

The future outlook for high-temperature superconductors is promising, with the potential for widespread commercial applications in various industries.