Recently, the research team led by Prof. Wu Ziyu from the China Synchrotron Radiation Laboratory and the team led by Chen Xianhui used X-ray absorption spectroscopy to study the isotope effect of iron-based superconducting materials on the three-dimensional atomic scale and made important progress. This result was published on the April 29th Nature Scientific Group (Scientific Reports) of Nature Publishing Group (NPG).
Since the discovery of iron-based superconducting materials in 2008, it has been one of the important research hotspots for condensed matter physics. However, there is widespread controversy over the understanding of iron-based superconducting mechanisms. Following the discovery of the isotope effects of iron-based superconducting materials using Tc and magnetic measurements for the first time, Professor Chen Xianhui of the school and Wu Ziyu’s research group [Nature 459, 64-67 (2009)] used temperature of newly developed isotope microscopic effects. Depending on the EXAFS detection method, the microscopic mechanism of the isotope effect of iron-based superconducting materials was studied. The latest research points out that for 
Superconductors and isotope doping have little effect on the average health and static distribution of Fe-As and Fe-Fe, but modulate their thermal disorder distribution; Fe-As of different iron isotope samples can be accurately obtained through correlation with Einstein model. With the characteristic frequency of Fe-Fe, the isotopic effect factors of the local lattice vibration of Fe-As and Fe-Fe were measured. The isotope effect factor measured by this microscopic method is basically the same as the isotope index measured by resistance and magnetic susceptibility, further indicating that the electro-phonon interaction is 
The superconducting mechanism plays an important role. At the same time, the Fe-Fe and Fe-As vibrations are distributed in different vertical planes. They have almost equivalent isotope effects, indicating that 
Has three-dimensional superconducting properties that are different from copper-based high-temperature superconducting materials.
The synchrotron radiation source has excellent characteristics such as high resolution, high monochromaticity, strong penetrability, and wide spectrum, and has become an important platform for cutting-edge scientific research. A series of new methods and technologies based on synchrotron radiation devices developed by the Wuziyu research group can be used to study the microlocal electronic/atomic structures of superconducting materials, magnetic materials, and various low-dimensional materials.
This project was supported by the Knowledge Innovation Project of the Chinese Academy of Sciences and the National Natural Science Foundation of China.
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