Comment on "Precision global measurements of London penetration depth in FeTe${}_{0.58}$Se${}_{0.42}$"

Abstract

Cho et al. [Phys. Rev. B, 84, 174502 (2011)] have reported on the temperature dependence of the London penetration depth deduced from Tunnel Diode Oscillator (TDO) measurements in optimally doped Fe(Se,Te) single crystals. According to their analysis, these measurements chould suggest a nodeless two-gap pairing symmetry with strong pair breaking effects. However, to reach this conclusion, the authors fit the temperature dependence of the superfluid density with a two band {\it clean} limit model which is incompatible with the presence of strong pair breaking effects, deduced from the $T^n$ temperature dependence of the London penetration depth below $T_c/3$. Moreover they claim that their results are also ruling out the suggestion that surface conditions can significantly affect the TDO data but this conclusion is based on one very specific damaging process, and is completely ignoring the large dispersion in the previously published TDO data.

3 pages

References in corpus (10)

• From (pi, 0) magnetic order to superconductivity with (pi, pi) magnetic resonance in Fe1.02(Te1-xSex)
• Lifting of nodes by disorder in extended-$s$ state superconductors: application to ferropnictides
• Physical properties of FeSe${}_{0.5}$Te${}_{0.5}$ single crystals grown under different conditions
• Thermodynamic phase diagram of Fe(Se${}_{0.5}$Te${}_{0.5}$) single crystals up to 28 Tesla
• Anisotropic Structure of the Order Parameter in FeSe0.45Te0.55 Revealed by Angle Resolved Specific Heat
• Calorimetric Evidence of Strong-Coupling Multiband Superconductivity in Fe(Te0.57Se0.43) Single Crystal
• Muon-spin-spectroscopy study of the penetration depth of FeTe0.5Se0.5
• Anisotropic fluctuations and quasiparticle excitations in FeSe_0.5Te_0.5
• How robust the global measurements of London penetration depth are: the case of Fe(Te${}_{1-x}$,Se${}_x$)
• Scaling of the physical properties in Ba(Fe,Ni)2As2 single crystals: Evidence for quantum fluctuations

Cited by in corpus (3)

• Superconducting properties of sulfur-doped iron selenide
• Magnetic and thermodynamic properties of Cu${}_x$TiSe${}_2$ single crystals
• Reply to "Comment on \emph{"Precision global measurements of London penetration depth in Fe(Te${}_{0.58}$Se${}_{0.42}$)"}"