Shulou(Shulou.com)12/24 Report--

CTOnews.com December 20 news, the Korean Superconducting Cryogenic Society recently released a white paper, concluded that "there is no evidence" to prove that LK-99 is a superconductor at room temperature and pressure. Although this room temperature superconducting event has settled, scientists' research on superconductors has never stopped.

The Harvard team, led by Philip Kim, made another major breakthrough in "high temperature" superconductors by using cupriates.

Philip King led his team to successfully develop "high temperature" superconducting diodes using a unique method of manufacturing cryogenic devices. This invention is very important for quantum computing and represents an important step in manipulating and understanding strange materials and quantum states.

Physicists have been studying superconductors for decades, but the superconducting material shows its properties only when it is close to absolute zero, so it has no commercial value at this stage.

The high temperature superconducting diode developed by Philip King is a crystal made of thin cupriate, which is equivalent to a switch that allows the current to flow in one direction when turned on.

The team's experiment was led by S. Y. Frank Zhao, a former student at Griffin Graduate School of Art and Science and now a postdoctoral fellow at the Massachusetts Institute of Technology.

In this experiment, the researchers used an airless cryogenic crystal manipulation method in ultra-pure argon (CTOnews.com remark: yà) argon to design a clean interface between two very thin layers of bismuth strontium calcium copper oxide (BSCCO).

Superconductors usually need to be superconducting at minus 400 degrees Fahrenheit (minus 240C), while BSCCO is considered a "high temperature" superconductor that can conduct superconductors at minus 288F (minus 177.7 degrees Celsius).

The researchers first divided the BSCCO into two layers, each 1/1000 the width of a human hair. Then, at minus 130 degrees Fahrenheit (minus 90 degrees Celsius), the researchers stacked the two layers in a 45-degree twist, maintaining the superconductivity of the fragile interface.

The team found that the maximum overcurrent that can pass through the interface without resistance varies according to the direction of the current, and the team has shown that the interface quantum state is electronically controlled by reversing this polarity.

The reference address of the paper is attached to CTOnews.com: S. Y. Frank Zhao et al.,Time-reversal symmetry breaking superconductivity between twisted cuprate superconductors.Science0,eabl8371DOI:10.1126/science.abl8371.

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