Research on iron-based superconducting materials using a steady-state magnetic field experimental device

Research on iron-based superconducting materials using a steady-state magnetic field experimental device

Yang Run, a researcher at the Institute of Physics of the Chinese Academy of Sciences, used deep-quick X-ray diffractometer (LT-XRD), a steady-state strong magnetic field experiment device, to conduct in-depth research on iron-based superconductor Ca0.86Pr0.14Fe2As2. And made progress.

In the process of exploring the mechanism of high temperature superconductivity, electron correlation and magnetism have always been considered to be closely related. Similar to copper-based superconductors, in the recent discovery of iron-based superconductors with a critical temperature TC of up to 55K, superconductivity may occur at the boundary of the antiferromagnetic phase by modulation by doping or pressure means. However, in the matrix of iron-based superconductors, the local magnetic properties are much stronger than in copper-based materials. Therefore, ferromagnetic superconducting materials are an ideal system for studying the interaction between electron correlation, magnetism, and superconductivity.

Yang Run conducted an in-depth study of iron-based superconductor Ca0.86Pr0.14Fe2As2 using a cryogenic X-ray diffractometer in a steady-state strong magnetic field experimental apparatus. The study found that in addition to the superconducting transition, the material exhibits a structural transition from a tetragonal to a collapsed tetragonal around 73K, but no bulk superconductivity exists in the collapsed tetragonal phase. At the same time, in the collapsed tetragonal phase, the electron correlation effect weakened, and spin fluctuations were suppressed. Studies have shown that after the structural transformation, the As-As bonds in the in-plane form a strong As-As interaction, which in turn affects the hybridization between the Fe-As, thus allowing the system to enter a non-magnetic Fermi liquid ( Fermi liquid) behavior.

The research was published in Physical Review B.

The variable temperature X-ray diffractometer in the steady state strong magnetic field experiment device can measure the X-ray diffraction spectrum of the crystal structure at low temperature and high temperature. The low temperature range is 15K-300K, the high temperature range is 300K-1700K, and the angle range of the goniometer is 0.1. ° to 140°, angular resolution 1/10000°.

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