Robustness of superconductivity to competing magnetic phases in tetragonal FeS

Kirschner, Franziska K. K.; Lang, Franz; Topping, Craig V.; Baker, Peter J.; Pratt, F. L.; Wright, Sophie E.; Woodruff, Daniel N.; Clarke, Simon J.; Blundell, Stephen J.

doi:10.1103/physrevb.94.134509

Cited by 20 publications

(14 citation statements)

References 38 publications

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“…1f). Furthermore, due to the complex de-intercalation procedure to prepare FeS, other byproducts could form [38]. Recently, a quantum oscillations study suggested that FeS has a 3D Fermi surface [20], not supported by the current ARPES studies.…”

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confidence: 69%

Suppression of electronic correlations by chemical pressure from FeSe to FeS

et al. 2017

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Iron-based chalcogenides are complex superconducting systems in which orbitally-dependent electronic correlations play an important role. Here, using high-resolution angle-resolved photoemission spectroscopy, we investigate the effect of these electronic correlations outside the nematic phase in the tetragonal phase of superconducting FeSe1−xSx (x = 0, 0.18, 1). With increasing sulfur substitution, the Fermi velocities increase significantly and the band renormalizations are suppressed towards a factor of 1.5 − 2 for FeS. Furthermore, the chemical pressure leads to an increase in the size of the quasi-two dimensional Fermi surface, compared with that of FeSe, however, it remains smaller than the predicted one from first principle calculations for FeS. Our results show that the isoelectronic substitution is an effective way to tune electronic correlations in FeSe1−xSx, being weakened for FeS with a lower superconducting transition temperature. This suggests indirectly that electronic correlations could help to promote higher-Tc superconductivity in FeSe.

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confidence: 69%

Suppression of electronic correlations by chemical pressure from FeSe to FeS

et al. 2017

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“…The temperature dependence of all four modes is governed by the contraction of the lattice, but shows anomalies at 50 K and below 20 K. The anomaly observed at 20 K has a correspondence in the thermal expansion 20 and µSR experiments 21,22 which indicate short-range magnetic order. The long-range magnetic order observed recently by neutron diffraction experiments 41 below T N =116 K has no correspondence in the Raman spec-tra.…”

Section: Discussionmentioning

confidence: 90%

“…Phonon energy (cm −1 ) Atomic displacement Calculation Experiment However, the anomaly at 20 K coincides with the emergence of short range magnetic order as inferred from two µSR studies. 21,22 Susceptibility measurements on a sample from the same batch were inconclusive. On the other hand, the XRD data show a small anomaly in the lattice parameters, and the unit cell volume does not saturate at low temperature but rather decreases faster between 20 K and 10 K than above 20 K. 20 This volume contraction by and large reproduces the change in the phonon energies as can be seen by closely inspecting the lowtemperature parts of Fig.…”

Section: Symmetrymentioning

confidence: 99%

Phonon anomalies in FeS

et al. 2018

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We present results from light scattering experiments on tetragonal FeS with the focus placed on lattice dynamics. We identify the Raman active A1g and B1g phonon modes, a second order scattering process involving two acoustic phonons, and contributions from potentially defect-induced scattering. The temperature dependence between 300 and 20 K of all observed phonon energies is governed by the lattice contraction. Below 20 K the phonon energies increase by 0.5-1 cm −1 thus indicating putative short range magnetic order. Along with the experiments we performed latticedynamical simulations and a symmetry analysis for the phonons and potential overtones and find good agreement with the experiments. In particular, we argue that the two-phonon excitation observed in a gap between the optical branches becomes observable due to significant electronphonon interaction.

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“…Below 70 K the diffusion slows down and the depolarization rate in ZF data saturates around B ∼ 0.35 μs −1 [18]. Depolarization due to diluted magnetic impurities [24] can be excluded since in this case the muons stopping at site A should be also affected by stray fields. However, we did not find any noticeable static contribution to the depolarization rate of site A.…”

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confidence: 99%