Journal
FRONTIERS IN PHYSICS
Volume 8, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fphy.2020.567054
Keywords
FeSe superconductors; Verwey-like transition; Fe-vacancy order; Mott insulators; Mixed-valence state
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Funding
- Ministry of Science and Technology [MOST108-2633-M-001-001]
- Academia Sinica Thematic Research Grant [AS-TP-106-M01]
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We carried out a detailed study to investigate the existence of an insulating parent phase for FeSe superconductors. The insulating Fe4Se5 with root 5 x root 5 Fe-vacancy order shows a 3D-Mott variable-range-hopping behavior with a Verwey-like electronic correlation at around 45 K. The application of the RTA process at 450 degrees C results in the destruction of Fe-vacancy order and induces more electron carriers by increasing the Fe3+ valence state. Superconductivity emerges with T (c) similar to 8 K without changing the chemical stoichiometry of the sample after the RTA process, resulting in the addition of extra carriers in favor of superconductivity.
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