Journal
PHYSICAL REVIEW B
Volume 89, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.140506
Keywords
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Funding
- Japan Society for the Promotion of Science (JSPS)
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
- Chinese Academy of Sciences (CAS)
- National Science Foundation of China (NSFC)
- Ministry of Science and Technology (MOST) of China, KEK-PF [2009S2-005, 2012S2-001]
- UVSOR [22-540]
- Grants-in-Aid for Scientific Research [23224010, 25287079, 24740215] Funding Source: KAKEN
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We have performed systematic angle-resolved photoemission spectroscopy (ARPES) of iron-chalcogenide superconductor FeTe1-x Se-x (0 <= x <= 0.45) to elucidate the electronic states relevant to the superconductivity. While the Fermi-surface shape is nearly independent of x, we found that the ARPES spectral line shape shows prominent x dependence. A broad ARPES spectrum characterized by a small quasiparticle weight at x = 0, indicative of incoherent electronic states, becomes progressively sharper with increasing x, and a well-defined quasiparticle peak appears around x = 0.45 where bulk superconductivity is realized. The present result suggests the evolution from incoherent to coherent electronic states and its close relationship to the emergence of superconductivity.
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