首页|Absence of BCS-BEC crossover in FeSe0.45Te0.55 superconductor

Absence of BCS-BEC crossover in FeSe0.45Te0.55 superconductor

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In iron-based superconductor Fe(Se,Te),a flat band-like feature near the Fermi level was observed around the Brillouin zone center in the superconducting state.It is under debate whether this is the evidence on the presence of the BCS-BEC[Bardeen-Cooper-Schrieffer(BCS),Bose-Einstein condensation(BEC)]crossover in the superconductor.High-resolution laser-based angle-resolved photoemission measurements are carried out on high quality single crystals of FeSe0.45Te0.55 superconductor to address the issue.By employing different polarization geometries,we have resolved and isolated the dyz band and the topological surface band,making it possible to study their superconducting behaviors separately.The dyz band alone does not form a flat band-like feature in the superconducting state and the measured dispersion can be well described by the BCS picture.We find that the flat band-like feature is formed from the combination of the dyz band and the topological surface state band in the superconducting state.These results reveal the origin of the flat band-like feature and rule out the presence of BCS-BEC crossover in Fe(Se,Te)superconductor.

FeSe0.45Te0.55ARPESelectronic structuresuperconducting gapBCS-BEC crossover

贾俊杰、谷亚东、殷超辉、束英杰、陈逸雯、史聚民、张杏、陈浩、苗泰民、任晓琳、梁波、朱文培、蔡能、张丰丰、张申金、杨峰、王志敏、彭钦军、许祖彦、毛寒青、刘国东、任治安、赵林、周兴江

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National Laboratory for Superconductivity,Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

University of Chinese Academy of Sciences,Beijing 100049,China

Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China

Songshan Lake Materials Laboratory,Dongguan 523808,China

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National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaStrategic Priority Research Program(B)of the Chinese Academy of SciencesStrategic Priority Research Program(B)of the Chinese Academy of SciencesInnovation Program for Quantum science and TechnologyYouth Innovation Promotion Association of the Chinese Academy of SciencesSynergetic Extreme Condition User Facility(SECUF)

2021YFA14018002022YFA16042002022YFA14039002023YFA140600012488201123740661207441112374154XDB25000000XDB330000002021ZD0301800Y2021006

2024

10.1088/1674-1056/ad51f9

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(7)
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