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28 March 2024 |
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Article overview
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Cooper Pairing and Phase Coherence in Iron Superconductor Fe1+x(Te,Se) | J. -X. Yin
; Zheng Wu
; X. Huang
; J. -H. Wang
; Z. -Y. Ye
; Rui Wu
; X. -X. Wu
; X. -J. Liang
; H. -Q. Mao
; Jian Li
; Y. -Y. Zhao
; C. -S. Ting
; J. -P. Hu
; Z. Q. Wang
; P. -H. Hor
; H. Ding
; S. H. Pan
; | Date: |
16 Feb 2016 | Abstract: | The Cooper pairing and phase coherence are two fundamental aspects of
superconductivity. Due to breaking time reversal symmetry, magnetic impurities
are detrimental to superconductivity, yet microscopically how they affect the
pairing strength and phase coherence in a real material is less understood.
Recently we observed a robust zero-energy bound state at an interstitial Fe
impurity (IFI) in superconducting Fe1+x(Te,Se), signifying intense impurity
scattering. Here we report a comprehensive study, using scanning tunnelling
microscopy/spectroscopy (STM/S) technique, of the global effects of IFIs on the
ground state of Fe1+x(Te,Se) over a wide range of IFI concentration x. Our high
resolution tunnelling spectroscopy and quasi-particle interference data at very
low temperature demonstrate that IFIs hardly affect the electron pairing
strength, while they cause significant decoherence of Cooper pairs in
precedence of the Coulomb correlation, eventually driving the ground state of
the system from strong-coupling-superconductor to diffusive-metal with
incoherent electron pairs. | Source: | arXiv, 1602.4961 | Services: | Forum | Review | PDF | Favorites |
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