Comment on “Cleavage surface of the BaFe2−xCoxAs2 and FeySe1−xTex superconductors: A combined STM plus LEED study”
M. Cordin, P. Amann, A. Menzel, E. Bertel, M. Baranov, S. Diehl, J. Redinger, C. Franchini
DOI 10.1103/PhysRevB.86.167401 · Physical Review B
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Abstract
Massee et al. [Phys. Rev. B 80, 140507(R) (2009)] found on the cleavage planes of BaFe2−xCoxAs2 two different long-range ordered structures, i.e., a (2×1) phase present only after cleavage at low temperature and a 2×2 phase observed after cleavage at room temperature. These results apply generally to 122 Fe-based superconductors, but have been discussed controversially [for a summary of the conflicting views, see Hoffman, Rep. Prog. Phys. 74, 124513 (2011)]. Here we support the interpretation of Massee et al. In addition, we argue that the existence of different long-range ordered structures corresponding to the same coverage in different temperature regimes is associated with the melting of a charge density wave and removal of an associated periodic lattice distortion (CDW/PLD) in the substrate as T is increased. At sufficiently low temperature the fluctuating CDW/PLD order parameter is stabilized by the adsorbate in a lock-in type mechanism. Accordingly, we interpret the surface structures observed on the 122 Fe pnictide surfaces as evidence for the presence of CDW fluctuations at low temperature, but with a wave vector differing from that of the antiferromagnetic spin-density fluctuations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2-xCoxAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| SrFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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