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Researchers at the Strong Magnetic Field Science Center of the Hefei Research Institute of Materials Science, Chinese Academy of Sciences have made new progress in the study of topological superconducting single crystals. The researchers obtained high-quality SrxBi2Se3 single crystals, which exhibit a superconducting volume ratio of up to 91.5%, and the material is very stable in air. The SrxBi2Se3 single crystal was studied using a steady-state strong magnetic field experimental device. The researchers found that the material has a periodic quantum oscillation signal in the magnetic field range of 10 Tesla to 35 Tesla. The existence of a topological protection surface state for this system is given. evidence of.
The topological superconducting state is a new state of matter. Unlike the traditional superconductor, the topological superconductor has a topologically protected gapless metal state with a thickness of about 1 nanometer while the interior is a superconductor. If a topological superconductor is divided into two, its new surface naturally appears a topologically protected metal state with a thickness of about 1 nanometer. This peculiar topological nature makes the topological superconductor an ideal material for a quantum computer that can never be mistaken.
In recent years, scientists around the world have shown great interest in finding potential topological superconducting materials. In 2010, Professor RJ Cava's research group at the University of Preston in the United States reported that superconductivity has appeared in CuxBi2Se3, which has caused international concern about whether the system is a topological superconductor. However, the following experimental progress shows that the superconducting volume ratio of CuxBi2Se3 superconductor is not high (up to only about 50%), and the material is extremely unstable in the air. These unfavorable factors greatly limit the superconductivity of the topology. further research.
The search for a new type of potential topological superconducting single crystal material is a challenging topic in current topological superconductor research. In the past five years, little progress has been made in this area. Recently, under the leadership of Zhang Yuheng, chief scientist of the Strong Magnetic Field Science Center, the team's researcher Chang Changjin's research group made new progress in the research of potential topological superconductivity single crystals. Using high-temperature melting methods, the researchers successfully inserted the alkaline-earth element Sr into Bi2Se3, a typical topological insulator material, to obtain a high quality SrxBi2Se3 single crystal, which exhibits a superconducting volume ratio of up to 91.5%. The researchers placed the material in the air for up to four months and found that the superconducting properties of the material did not change, indicating that it was very stable in the air.
The researchers studied the topological properties of the SrxBi2Se3 single crystal using the water-cooled magnet of the steady state magnetic field experiment device No. 5 and found that the material exhibits periodic quantum oscillation signals in the magnetic field range of 10 Tesla to 35 Tesla. The oscillating signal was analyzed and the researchers gave evidence of the existence of a topologically protected surface state for this system. These results indicate that SrxBi2Se3 single crystal is an ideal material for the study of topological superconductivity.
The research results are based on the Superconductivity with topological surface state in SrxBi2Se3 and are published in the Journal of the American Chemistry Society.
The study was supported by the National Key Basic Research Program, the National Natural Science Foundation, and the Scientific Research Project of the Hefei University Science Center.
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