Photoelectron Holography Study of La(O,F)BiS2

Ya Jun Li, Ze Xu Sun, Noriyuki Kataoka, Taro Setoguchi, Yusuke Hashimoto, Soichiro Takeuchi, Shunjo Koga, Satoshi Demura, Kanako Noguchi, Hideaki Sakata, Yoshikazu Mizuguchi, Tomohiro Matsushita, Takanori Wakita, Yuji Muraoka, Takayoshi Yokoya

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We performed photoelectron and Auger-electron holography to study the local structure of La(O,F)BiS2. We found that the previously reported surface-dominant Bi 4f component exhibits a hologram pattern derived from the forward focusing peaks. This provides spectroscopic evidence of the existence of two bulk Bi chemical sites. A comparison of the experimental holograms with the simulated holograms using the tetragonal and charge density wave (CDW) models, as well as with a monoclinic structure model proposed for the high-pressure phase exhibiting the highest superconducting transition temperature among BiS2-based superconductors, showed that the monoclinic structure model does not reproduce the experimental hologram. This suggests that it may not be a dominant local structure for as-grown La(O,F)BiS2. The experimental hologram of the F KLL Auger electron is similar to that of the O KLL, providing direct evidence that F atoms are incorporated into the O sites. These results are valuable for understanding the physical properties of La(O,F)BiS2.

Original languageEnglish
Article number044801
JournalJournal of the Physical Society of Japan
Volume92
Issue number4
DOIs
Publication statusPublished - 15 Apr 2023

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