Superconductivity in the PbO-type Structure α–FeSe

Superconductivity in the PbO-type Structure α–FeSe

| Fong-Chi Hsu, Jiu-Yong Luo, Kuo-Wei Yeh, Ta-Kun Chen, Tzu-Wen Huang, Phillip M. Wu, Yong-Chi Lee, Yi-Lin Huang, Yan-Yi Chu, Der-Chung Yan, and Maw-Kuen Wu
The paper reports the discovery of superconductivity in the PbO-type α–FeSe compound with a zero resistance transition temperature (Tc) of 8K. This finding is significant because it shares a similar planar crystal sublattice with layered iron-based oxypnictides, which have exhibited superconductivity. Unlike these oxypnictides, FeSe is easier to handle and fabricate, making it a promising candidate for unconventional superconductors. The study involved synthesizing polycrystalline samples of FeSe1-x with nominal concentrations of x = 0.03 and 0.18, and using X-ray diffraction to confirm the presence of the tetragonal α-FeSe phase. Electrical resistivity measurements showed a broad bump at about 250K and a zero resistance transition at 8K. Magnetic susceptibility and specific heat measurements further confirmed the superconducting properties. Additionally, high-resolution X-ray diffraction revealed a structural transformation at ~105K, suggesting a possible connection to the superconductivity. The results open new avenues for exploring unconventional superconductors with the PbO-type structure.The paper reports the discovery of superconductivity in the PbO-type α–FeSe compound with a zero resistance transition temperature (Tc) of 8K. This finding is significant because it shares a similar planar crystal sublattice with layered iron-based oxypnictides, which have exhibited superconductivity. Unlike these oxypnictides, FeSe is easier to handle and fabricate, making it a promising candidate for unconventional superconductors. The study involved synthesizing polycrystalline samples of FeSe1-x with nominal concentrations of x = 0.03 and 0.18, and using X-ray diffraction to confirm the presence of the tetragonal α-FeSe phase. Electrical resistivity measurements showed a broad bump at about 250K and a zero resistance transition at 8K. Magnetic susceptibility and specific heat measurements further confirmed the superconducting properties. Additionally, high-resolution X-ray diffraction revealed a structural transformation at ~105K, suggesting a possible connection to the superconductivity. The results open new avenues for exploring unconventional superconductors with the PbO-type structure.
Reach us at info@study.space