Comment on "Unconventional s-wave superconductivity in Fe(Se,Te)"

Mazin, I. I.; Singh, D. J.

doi:10.48550/arxiv.1007.0047

Cited by 11 publications

(14 citation statements)

References 6 publications

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“…The sign-changing s± OP is therefore strongly supported by STM in FeTe 0.6 Se 0.4 . A concern was raised by Mazin et al [166], who pointed out that all three q-vectors discussed by Hanaguri seem too sharp to be ascribed to QPI, and in fact each corresponds to long range structural or magnetic order in the crystal. In particular (referring to the crystal lattice parameters defined in figures 7a and b), q 1 = 2π/a Fe−Fe , q 2 = 2π/a O , and q 3 = 2π/a T would each correspond to long range crystalline order and give rise to sharp q-space peaks.…”

Section: Superconducting Order Parametermentioning

confidence: 99%

Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors

2011

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In the first three years since the discovery of Fe-based high Tc superconductors, scanning tunneling microscopy (STM) and spectroscopy have shed light on three important questions. First, STM has demonstrated the complexity of the pairing symmetry in Fe-based materials. Phase-sensitive quasiparticle interference (QPI) imaging and low temperature spectroscopy have shown that the pairing OP varies from nodal to nodeless s± within a single family, FeTe1−xSex. Second, STM has imaged C4 → C2 symmetry breaking in the electronic states of both parent and superconducting materials. As a local probe, STM is in a strong position to understand the interactions between these broken symmetry states and superconductivity. Finally, STM has been used to image the vortex state, giving insights into the technical problem of vortex pinning, and the fundamental problem of the competing states introduced when superconductivity is locally quenched by a magnetic field. Here we give a pedagogical introduction to STM and QPI imaging, discuss the specific challenges associated with extracting bulk properties from the study of surfaces, and report on progress made in understanding Fe-based superconductors using STM techniques.

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Section: Superconducting Order Parametermentioning

confidence: 99%

Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors

2011

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“…In particular, in the presence of vortices an additional source of scattering either suppresses or enhances intra-and inter-pocket scattering depending on the symmetry of the superconducting gap 30 , a feature found also in the experimental data 28 . At the same time, the experimental results have been put into question and argued instead to arise from the Bragg scattering and not due to QPI 32 .…”

Section: Introductionmentioning

confidence: 99%

Quasiparticle interference in iron-based superconductors

et al. 2010

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We systematically calculate quasiparticle interference (QPI) signatures for the whole phase diagram of iron-based superconductors. Impurities inherent in the sample together with ordered phases lead to distinct features in the QPI images that are believed to be measured in spectroscopic imaging-scanning tunneling microscopy (SI-STM). In the spin-density wave phase the rotational symmetry of the electronic structure is broken, signatures of which are also seen in the coexistence regime with both superconducting and magnetic order. In the superconducting regime we show how the different scattering behavior for magnetic and non-magnetic impurities allows to verify the $s^{+-}$ symmetry of the order parameter. The effect of possible gap minima or nodes is discussed.Comment: 19 pages, 7 figure

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“…With Ref. 29 in mind we note that the sign preserving QPI peaks at q 3 might be very sharp, since the nesting condition is perfectly fulfilled for intrapocket scattering.…”

Section: Discussionmentioning

confidence: 94%

Quasiparticle interference in an iron-based superconductor

Sykora

Coleman

2011

Phys. Rev. B

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We develop a model for the effect of a magnetic field on quasiparticle interference in an iron-based superconductor. Recently, scanning tunneling experiments have been performed on Fe(Se,Te) to determine the relative sign of the superconducting gap from the magnetic-field dependence of quasiparticle scattering amplitudes. Using a simple two-band BCS model, we study three different cases of scattering in a spin-split spectrum. The dominant effect of a magnetic field in iron-based superconductors is caused by the Pauli limiting of conduction electrons. Thereby time reversal odd scattering is induced which enhances the sign-preserving and depresses the sign-reversing peaks in the quasiparticle interference patterns.Comment: final version, some changes in the tex

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Comment on "Unconventional s-wave superconductivity in Fe(Se,Te)"

Cited by 11 publications

References 6 publications

Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors

Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors

Quasiparticle interference in iron-based superconductors

Quasiparticle interference in an iron-based superconductor

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