Huang Fuqiang, Research Institute of Shanghai Institute of Ceramics, Chinese Academy of Sciences, cooperated with Shanghai Institute of Microsystem and Beijing University of Chinese Academy of Sciences to re-stack the films into tantalum disulfide thin films by chemical stripping into monolayer tantalum disulfide nanosheets . The reassembled tantalum disulfide film breaks the crystal structure of the precursor and forms a rich homogeneous interface with higher superconducting transition temperature and larger upper critical field than the parent material. Relevant research results recently published in the Journal of the American Chemical Society. Since superconductivity was discovered in 1911, the study of superconductivity has become the most brilliant pearl on the crown of condensed matter physics. At present, superconducting materials have been used in various fields including superconducting wires, superconducting nuclear magnetic resonance imaging devices used in hospitals and maglev trains. However, despite the many advantages of superconducting materials, the cost of superconducting materials is still high due to the maximum superconducting temperature below minus 100 degrees Celsius, making it difficult to popularize large areas. Therefore, the pursuit of higher temperature and even room temperature superconductivity is a physicist's dream, but also has very high practical value. "At present, due to a lack of theoretical support, the exploration of high-temperature superconductivity is struggling." The first author of the paper, Pan Jie, a master's graduate student at the Shanghai Institute of Ceramics, said that traditional BCS theories based on weak electro-acoustic interactions are difficult to interpret More than 40 K superconductivity mechanism, therefore, we need to put forward more complete and more profound theory to explain the phenomenon of high temperature superconductivity, and to provide guidance for the exploration of high temperature superconducting light. The discovery of interface superconductivity is a new bright spot in the field of superconductivity in recent years. However, the electronic structure of interface-regulated hexagonal tantalum disulfide (2H-TaS2) has not been reported yet. To build a rich interface in tantalum disulfide, the research team obtained a single layer of tantalum disulfide nanosheet by intercalation and deintercalation with alkali metal ions and assembly by suction filtration to obtain a heavy-stacked disulfide Tantalum film. There is irregular twist between the inner layer and the layer of the film, destroying the original crystal structure and forming a homogeneous interface. Further studies have found that the re-stacked tantalum disulfide film has an electron specific heat coefficient γ that is twice that of the bulk hexagonal tantalum disulfide. Based on the Debye model theory of solid specific heat, a larger electron specific heat coefficient γ indicates that the tantalum disulfide film has more electron density near the Fermi surface. In order to better explain the mechanism of superconducting enhancement in heavy-stacked tantalum disulfide films, the research team used density functional theory to simulate the electronic structures of the two materials. The calculated results show that the tantalum disulfide film after re-stacking has an increased degree of electron deionization at the interface due to the distortion between the layers, resulting in an increase in the density of electron states near the Fermi surface and an increase in superconductivity. Researcher Huang Fuqiang said that the research results enriched the research content of interfacial superconducting, which provided a good research idea for perfecting superconductivity theory and exploring higher temperature superconducting system.
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