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Two superconducting transition temperatures in LiFeAs detected by 75As nuclear magnetic resonance | S.-H. Baek
; L. Harnagea
; S. Wurmehl
; B. Büchner
; H.-J. Grafe
; | Date: |
7 Nov 2012 | Abstract: | $^{75}$As NMR investigation of a single crystal of superconducting LiFeAs is
presented. The Knight shift and the in situ ac susceptibility measurements as a
function of temperature and external field reveal two superconducting (SC)
transition temperatures, each of which is associated with its own upper
critical field. Strikingly, the Knight shift maintains its normal state value
in the SC state at high temperatures, whereas it drops abruptly entering the
other state at low temperatures indicating the occurrence of spin-singlet
pairing. We discuss that the anomalous SC state at high temperatures emerges
due to the extreme sensitivity of the system stemming from its inherent
closeness to a critical instability toward ferromagnetism. | Source: | arXiv, 1211.1594 | Services: | Forum | Review | PDF | Favorites |
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