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Massee, F.; Jong, S. de; Huang, Yingkai; Kaas, J.; Heumen, E. van; Goedkoop, J. B.; Golden, M. S.

doi:10.1103/physrevb.80.140507

Cited by 92 publications

(102 citation statements)

References 9 publications

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“…Figure 1(c) and (d) show the atomically-resolved STM images with opposite-polarity bias on the same location of a cleaved FeTe surface. They are similar to previous STM studies of Fe-chalcogenides [16][17][18] , where no reconstruction is observed. The lattice constant estimated from Fourier transform of the image is ∼ 3.8Å, in good agreement with that obtained from the bulk 14 .…”

supporting

confidence: 80%

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Nanoscale chemical phase separation in FeTe0.55Se0.45as seen via scanning tunneling spectroscopy

Zhang

et al. 2011

Phys. Rev. B

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supporting

confidence: 80%

“…We note few "big bright spots" that are randomly distributed on the surface. These have been assumed to be excess Fe atoms 16,17 . Nevertheless, these "big bright spots" are located at the bridge site of the surface lattice, which is consistent the results of X-ray diffraction refinement 14 and density functional investigation 19 .…”

mentioning

confidence: 99%

Nanoscale chemical phase separation in FeTe0.55Se0.45as seen via scanning tunneling spectroscopy

Zhang

et al. 2011

Phys. Rev. B

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“…Low-energy electron diffraction and STM studies show no indication of a surface reconstruction. 16,17 …”

Section: Introductionmentioning

confidence: 99%

Spatial inhomogeneity of the superconducting gap and order parameter in FeSe0.4Te0.6

et al. 2013

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We have performed a low-temperature scanning tunneling microscopy and spectroscopy study of the iron chalcogenide superconductor FeSe 0.4 Te 0.6 with T C ≈ 14 K. Spatially resolved measurements of the superconducting gap reveal substantial inhomogeneity on a nanometer length scale. Analysis of the structure of the gap seen in tunneling spectra by comparison with calculated spectra for different superconducting order parameters (s-wave, d-wave, and anisotropic s-wave) yields the best agreement for an order parameter with anisotropic s-wave symmetry with an anisotropy of ∼40%. The temperature dependence of the superconducting gap observed in places with large and small gap size indicates that it is indeed the superconducting transition temperature which is inhomogeneous. The temperature dependence of the gap size has been found to differ from the one predicted by BCS theory. An analysis of the local gap size in relation to the local chemical composition shows almost no correlation with the local concentration of Se/Te atoms at the surface.

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“…In their article, the authors demonstrated the expected magnetic field dependence of the interference pattern due to quasi-particle scattering off magnetic vortices. Since there are many families in the iron-based superconductors, the available results of STM measurements 1,[23][24][25][26][27][28][29] are still limited to reach a consensus. An intriguing question appears to us is how the hole-doped pnictide superconductors will behave in a magnetic field.…”

mentioning

confidence: 99%

Observation of ordered vortices with Andreev bound states in Ba0.6K0.4Fe2As2

Shan¹,

Wang²,

Shen³

et al. 2011

Nature Phys

122

108

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For a type-II superconductor, when the applied magnetic field is higher than the lower critical value H c1 , the magnetic flux will penetrate into the superconductor and form quantized vortices, which usually are arranged in an Abrikosov lattice. For the newly discovered iron pnictide superconductors, previous measurements have shown that, in electron-doped BaFe 2 As 2 , the vortices form a highly disordered structure 1-3 . In addition, the density of states (DOS) within the vortex cores 1 do not exhibit the Andreev bound states in conventional superconductors 4 -8 . In this Letter, we report the observation of a triangular vortex lattice and the Andreev bound states in hole-doped BaFe 2 As 2 by using a low temperature scanning tunneling microscope (STM). Detailed study of the vortex cores reveals that the spectrum of the Andreev bound states inside the vortex core exhibits a distinct spatial evolution: at the center of the vortex core, it appears as a single peak at 0.5 mV below the Fermi-energy; away from the core center, it gradually evolves into two sub-peaks and they eventually fade out. The drastic differences between the vortex cores of the electron-doped and hole-doped counterparts are illusive to the pairing mechanism of the iron pnictide superconductors.Magnetic flux quantization is one of the important quantum phenomena in the mixed

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Cleavage surfaces of theBaFe2−xCoxAs2and

Cited by 92 publications

References 9 publications

Nanoscale chemical phase separation in FeTe0.55Se0.45as seen via scanning tunneling spectroscopy

Nanoscale chemical phase separation in FeTe0.55Se0.45as seen via scanning tunneling spectroscopy

Spatial inhomogeneity of the superconducting gap and order parameter in FeSe0.4Te0.6

Observation of ordered vortices with Andreev bound states in Ba0.6K0.4Fe2As2

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