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High-temperature superconductivity from fine-tuning of Fermi-surface singularities in iron oxypnictides | A. Charnukha
; D. V. Evtushinsky
; C. E. Matt
; N. Xu
; M.Shi
; B. Büchner
; N. D. Zhigadlo
; B. Batlogg
; S. V. Borisenko
; | Date: |
12 Jan 2016 | Abstract: | In the family of the iron-based superconductors, the $RE$FeAsO-type compounds
(with $RE$ being a rare-earth metal) exhibit the highest bulk superconducting
transition temperatures ($T_{mathrm{c}}$) up to $55 extrm{K}$ and thus hold
the key to the elusive pairing mechanism. Recently, it has been demonstrated
that the intrinsic electronic structure of SmFe$_{0.92}$Co$_{0.08}$AsO
($T_{mathrm{c}}=18 extrm{K}$) is highly nontrivial and consists of multiple
band-edge singularities in close proximity to the Fermi level. However, it
remains unclear whether these singularities are generic to the $RE$FeAsO-type
materials and if so, whether their exact topology is responsible for the
aforementioned record $T_{mathrm{c}}$. In this work, we use angle-resolved
photoemission spectroscopy (ARPES) to investigate the inherent electronic
structure of the NdFeAsO$_{0.6}$F$_{0.4}$ compound with a twice higher
$T_{mathrm{c}}=38 extrm{K}$. We find a similarly singular Fermi surface and
further demonstrate that the dramatic enhancement of superconductivity in this
compound correlates closely with the fine-tuning of one of the band-edge
singularities to within a fraction of the superconducting energy gap $Delta$
below the Fermi level. Our results provide compelling evidence that the
band-structure singularities near the Fermi level in the iron-based
superconductors must be explicitly accounted for in any attempt to understand
the mechanism of superconducting pairing in these materials. | Source: | arXiv, 1601.2686 | Services: | Forum | Review | PDF | Favorites |
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