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arXiv · 2110.14463

Cu doping effects on the electronic structure of Fe1-xCuxSe

Soonsang Huh·Zouyouwei Lu·Youn Sik Kim·Donghan Kim·Shaobo Liu·Mingwei Ma·Li Yu·Fang Zhou·Xiaoli Dong·Changyoung Kim·Zhongxian Zhao
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Abstract

Using angle-resolved photoemission spectroscopy (ARPES), we studied the evolution of the electronic structure of Fe1-xCuxSe from x = 0 to 0.10. We found that the Cu dopant introduces extra electron carriers. The hole bands near the gamma point are observed to steadily shift downward with increasing doping and completely sink down below the Fermi level (EF) for x > 0.05. Meanwhile, the electron pocket near the M point becomes larger but loses the spectral weight near EF. We also observed that effective mass of the electron band near the M point increases with doping. Our result explains why superconductivity disappears and metal insulator transition (MIT) like behavior occurs upon Cu doping in terms of electronic structure, and provide insight into emergent magnetic fluctuation in Fe1-xCuxSe.

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Soonsang Huh, Zouyouwei Lu, Youn Sik Kim, Donghan Kim, Shaobo Liu, Mingwei Ma, Li Yu, Fang Zhou, Xiaoli Dong, Changyoung Kim, Zhongxian Zhao. 2021-10-27. Cu doping effects on the electronic structure of Fe1-xCuxSe. https://doi.org/10.1103/physrevb.105.245140

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