China University of Science and Technology found that new iron-based superconducting materials have superconducting transition temperatures of up to 40K

Professor Chen Xianhui from the National Laboratory of Physical Sciences at Hefei Microscale, University of Science and Technology of China, made significant progress in the field of iron-based superconductivity research, and discovered a new iron-based superconducting material lithium iron oxyhydroxide selenium compound [(Li0.8Fe0 .2) OHFeSe], whose superconducting transition temperature is as high as 40K (below 233.15 degrees Celsius), and determines the crystal structure of the new material, and found that its superconductivity and antiferromagnetic coexistence.

Iron-based high-temperature superconductors are the research hotspots in the field of condensed matter physics. Iron-selenium (FeSe) superconductors are considered to be ideal material systems for studying iron-based superconducting mechanisms due to their unique properties. In order to be able to deeply explore the physical mechanism of iron-based high-temperature superconductivity, it is not necessary to find a new iron-selenium superconducting material with high superconducting transition temperature and stable in air, suitable for physical measurement.

For the first time, Chen Xianhui's research group successfully discovered a new iron-selenium superconducting material lithium iron oxyhydroxide selenium compound using hydrothermal reaction method. The superconducting transition temperature is as high as 40K or more. The material is formed by alternately stacking an iron-selenium layer and a lithium-iron-hydrogen-oxygen layer, and the iron-selenium layer and the lithium-iron-hydrogen-oxygen layer are connected by extremely weak hydrogen bonds. They collaborated with several research groups such as Dr. Huang Qingzhen from the National Institute of Standards and Technology's Neutron Research Center and Professor Wu Tao from the Chinese University of Science and Technology. They accurately determined the combination of X-ray diffraction, neutron scattering and nuclear magnetic resonance. The crystal structure of the new material. Several measurements indicate that the new superconducting material has an antiferromagnetic order at a low temperature of about 8.5K and coexists with superconductivity.

Experts said that this is the first time to discover new high-temperature superconducting materials of iron and selenium by hydrothermal method, which provides a new research idea for the exploration of new superconductors in related systems. At the same time, the advantages of high superconducting transition temperature and air stability of the new superconductor provide further experimental research and provide an ideal material system for exploring the intrinsic physical mechanism of iron-based high-temperature superconductivity. Relevant research results were published online on December 15th in the international authoritative journal Nature-Materials.

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