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29 March 2024
 
  » arxiv » 1107.0985

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Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe0.55Se0.45
H. Miao ; P. Richard ; Y. Tanaka ; K. Nakayama ; T. Qian ; K. Umezawa ; T. Sato ; Y.-M. Xu ; Y.-B. Shi ; N. Xu ; X.-P. Wang ; P. Zhang ; H.-B. Yang ; Z.-J. Xu ; J. S. Wen ; G.-D. Gu ; X. Dai ; J.-P. Hu ; T. Takahashi ; H. Ding ;
Date 5 Jul 2011
AbstractThe momentum distribution of the energy gap opening at the Fermi level of superconductors is a direct fingerprint of the pairing mechanism. While the phase diagram of the iron-based superconductors promotes antiferromagnetic fluctuations as a natural candidate for electron pairing, the precise origin of the interaction is highly debated. We used angle-resolved photoemission spectroscopy to reveal directly the momentum distribution of the superconducting gap in FeTe1-xSex, which has the simplest structure of all iron-based superconductors. We found isotropic superconducting gaps on all Fermi surfaces whose sizes can be fitted by a single gap function derived from a strong coupling approach, strongly suggesting local antiferromagnetic exchange interactions as the pairing origin.
Source arXiv, 1107.0985
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