Superconductivity enhancement of two-dimensional material indium selenide during pressure relief
Under high pressure conditions, some substances will appear superconducting. However, with the removal of pressure, this superconductivity tends to disappear. A well-known international material academic journal "Advanced Materials" published on the 10th article said that the Beijing High-pressure Science Research Center National "Thousand-person Plan" special expert Chen Bin researcher and international team led by Professor Gao Chunxiao of Jilin University for the first time discovered that the two-dimensional material selenium Indium has superconductivity enhancement during the pressure relief process, making the application of high-pressure superconducting materials possible.
Chen Bin said in an interview with a reporter from the Science and Technology Daily on the 12th that the electronic structure of indium selenide, a two-dimensional layered material, can be regulated by external pressure. The characteristics obtained by the regulation can still be maintained when the pressure is released to a lower pressure. This facilitates the preservation of high pressure-induced superconductivity under low pressure and even room pressure conditions.
Dr. Ke Feng, the main researcher of the research work, further pointed out that indium selenide is very sensitive to the external conditions, and the conversion between different electronic states can be achieved by changing the external environment, which is conducive to obtaining the required superconducting states through pressure regulation. In indium selenide, the pressure induced 2D to 3D structural phase transition is different from that of other 2D materials, suggesting that the electronic structure's evolutionary behavior under pressure is also different from that of other layered transition metal sulfides. A completely different phenomenon of superconductivity.
In the two-dimensional material indium selenide, the team was surprised to find that the pressure-induced superconductivity was enhanced during the depressurization process. The superconducting temperature is nearly double that of the boosting process and maintains a very low pressure. "These results show that proper selection of materials can make the application of high-voltage superconductivity possible," Chen Bin said. "Although there are still many in-depth scientific issues that we need to dig, the study is at least a step toward room temperature superconductivity. One of the beginnings. I believe there will be more surprises in two-dimensional materials." (Reporter Jiang Jing)
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