Interplay between lattice and spin states degree of freedom in the FeSe superconductor: Dynamic spin state instabilities

Gnezdilov, V. P.; Pashkevich, Yu. G.; Lemmens, P.; Wulferding, Dirk; Shevtsova, T. N.; Gusev, Alexander; Чареев, Д. А.; Vasiliev, A. N.

doi:10.1103/physrevb.87.144508

Cited by 65 publications

(93 citation statements)

References 54 publications

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“…53 Raman studies of thin films of SnO, 68 and single crystals of both FeTe 70 and FeSe 71 show the absence of the E g modes because of crystal orientation. (On the other hand, the E g modes were detected e.g.…”

Section: Resultsmentioning

confidence: 99%

Raman Spectroscopy of Mackinawite FeS in Anodic Iron Sulfide Corrosion Products

Genchev

Erbe

2016

J. Electrochem. Soc.

119

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Raman spectroscopy in a confocal microscope was used to study electrochemically synthesized corrosion products from sour gas experiments. When exposed to oxygen-containing atmosphere, the initial mackinawite FeS corrosion product transformed under laser irradiation to hematite, Fe 2 O 3 . Measurements with a thin water layer on top of the corrosion products prevented the transformation, as drying was prevented. In situ Raman measurements of mackinawite formation avoided the problem of transformation completely. In situ and operando, the initially formed mackinawite showed two Raman peaks in the wavenumber range >180 cm −1 centered around 200-215 cm −1 and 285-300 cm −1 . On an empirical basis, these modes were assigned to a B 1g mode of the iron sublattice and an A 1g mode of the sulfur sublattice, respectively. A comparison with a literature assignment for aged mackinawite suggests that the aging observed involves significant changes in the sulfur sublattice. Corrosion of iron in H 2 S containing solutions is a general problem in crude oil and natural gas production, and is generally referred to as sour corrosion. Aqueous H 2 S solutions promote corrosion of steels, [1][2][3] but the exact nature and mechanisms of corrosion strongly depend on the reaction conditions. 4-7 While the process has been widely investigated for pure iron, [8][9][10][11][12] and carbon steels, [13][14][15][16][17] there is still a lack of understanding of the reaction path and electronic properties of the corrosion products. 18,19The chemistry of the corrosion products formed during H 2 Striggered corrosion is rather complex, as there are many different solids consisting only of iron and sulfur. 20 However, mackinawite has been found to be the initial, 8,21 and probably most important corrosion product, of iron in aqueous sulfide solutions as it was observed in reactions carried out over a wide range of pH and temperature. 11,19,[22][23][24] It possesses a tetragonal, layered crystal structure, [25][26][27] and can be synthesized by precipitation from solutions containing Fe 2+ and S 2− solutions, 28,29 or by reaction of sulfide solution with metallic iron. 19,21,26,30 In the field of microbially induced corrosion, sulfatereducing bacteria are known to transform sulfate compounds into iron sulfides, e.g. mackinawite. [31][32][33][34][35][36] Raman spectroscopy has become an important tool for identification of corrosion products. [37][38][39][40][41][42][43][44][45] Some major problems may still occur due to laser heating, fluorescence, or low sensitivity as a consequence of the small cross-sections of Raman scattering. However, the fact that glass and water are both very weak Raman scatterers makes this technique suitable for in situ measurements in aqueous environments. 46-48The presence of water has an additional positive effect on the process as it decreases the heating from the laser. The use of (in situ and operando) Raman spectroscopy for study corrosion process studies of iron in sulfide rich environments has been already repor...

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Section: Resultsmentioning

confidence: 99%

Raman Spectroscopy of Mackinawite FeS in Anodic Iron Sulfide Corrosion Products

Genchev

Erbe

2016

J. Electrochem. Soc.

119

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“…Fig. 9 shows the polarized Raman spectrum of FeSe 0.96 single crystal [72]. With quasi-back-scattering configuration, the Raman spectrum exhibits two distant peaks at 182 cm -1 for A 1g (Se) mode and 206 cm -1 for B 1g (Fe) mode.…”

Section: Fese 1-x Te Xmentioning

confidence: 96%

“…al. [71], phonon dynamics in FeSe 1-x Te x were examined by several groups using Raman spectroscopy [72][73][74][75][76]. Fig.…”

Section: Fese 1-x Te Xmentioning

confidence: 99%

Superconductivity in Fe-chalcogenides

Chang

Chen

Lee

et al. 2015

Physica C: Superconductivity and its Applications

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“…8,42 This is not accounted for by the orthorhombic distortion alone, in agreement with the small B 1g Raman intensity observed below the nonmagnetic structural transition in FeSe. 44 The aim of this paper is to analyze the unusual Raman response and the changes on the phonon properties in the magnetic state. We show that the dynamical electron-phonon coupling can be responsible for large and unconventional anomalies in the phonon Raman spectrum.…”

Section: Introductionmentioning

confidence: 99%

Coupling of the AsA1gphonon to magnetism in iron pnictides

et al. 2013

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Charge, spin, and lattice degrees of freedom are strongly entangled in iron superconductors. A neat consequence of this entanglement is the behavior of the A 1g As-phonon resonance in the different polarization symmetries of Raman spectroscopy when undergoing the magnetostructural transition. In this work, we show that the observed behavior could be a direct consequence of the coupling of the phonons with the electronic excitations in the anisotropic magnetic state. We discuss this scenario within a five-orbital tight-binding model coupled to phonons via the dependence of the Slater-Koster parameters on the As position. We identify two qualitatively different channels of the electron-phonon interaction: a geometrical one related to the Fe-As-Fe angle α and another one associated with the modification upon As displacement of the Fe-As energy integrals pdσ and pdπ. While both mechanisms result in a finite B 1g response, the behavior of the phonon intensity in the A 1g and B 1g Raman polarization geometries is qualitatively different when the coupling is driven by the angle or by the energy integral dependence. We discuss our results in view of the experimental reports.

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Interplay between lattice and spin states degree of freedom in the FeSe superconductor: Dynamic spin state instabilities

Cited by 65 publications

References 54 publications

Raman Spectroscopy of Mackinawite FeS in Anodic Iron Sulfide Corrosion Products

Raman Spectroscopy of Mackinawite FeS in Anodic Iron Sulfide Corrosion Products

Superconductivity in Fe-chalcogenides

Coupling of the AsA1gphonon to magnetism in iron pnictides

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