Upper critical field and quantum oscillations in tetragonal superconducting FeS

Terashima, Taichi; Kikugawa, Naoki; Lin, Hai; Zhu, X. D.; Wen, Hao; Nomoto, Takuya; Suzuki, Katsuhiro; Ikeda, Hiroaki; Uji, S.

doi:10.1103/physrevb.94.100503

Cited by 15 publications

(27 citation statements)

References 49 publications

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“…While the size of the quasi-two dimensional Fermi surface increases with chemical pressure, the most important change is the increase in Fermi velocities (and bandwidths) ( Fig.3d), which reflects the reduction of the electronic correlations. These findings agree with the reduction of the effective masses determined from quantum oscillations in FeSe 1−x Se x outside the nematic phase [19,34] and FeS [20,21]. Furthermore, the low temperature resistivity shows a T 2 Fermi-liquid-like behavior for FeS, in contrast to the other compositions closer to 0.05 the nematic phase, as shown in Fig.3(e) and also reported in Ref.…”

supporting

confidence: 91%

“…3(d)) significantly increase from FeSe towards FeS, whereas the quasiparticle effective masses, m , of the outer hole-like bands decrease from 3-4 m e for x = 0.18 to 1-2 m e for FeS. These findings agree with the reduction of the effective masses detected in quantum oscillations studies in FeSe 1−x S x (outside the nematic phase) [19] and in FeS [21]. Electron bands of tetragonal FeSe 1−x S x .…”

supporting

confidence: 86%

“…However, sulfur substitution in FeSe 1−x S x completely suppresses the nematic state for x ≥ 0.18(1) [6,18,19], without promoting a high-T c superconducting phase or stabilizing a magnetic order, in contrast to applied pressure [14,15]. The end member of this series, the tetragonal FeS, with a lower T c ≈ 4 K, is suggested to be less correlated [20,21], emphasizing the important role of chemical pressure in tuning electronic ground states and the strength of electronic correlations.…”

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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: 91%

supporting

confidence: 86%

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confidence: 99%

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Suppression of electronic correlations by chemical pressure from FeSe to FeS

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“…Thus charge carriers in FeS have lower effective masses than those of FeSe whose masses range from 1.9 to 7.2m 0 [39].Notice that we obtain somewhat heavier masses for the α and β orbits than the values reported in Ref. 38. We re-analyzed our data by, for instance, extracting the effective masses from different field windows.…”

Section: Resultsmentioning

confidence: 71%

Spin excitations and the Fermi surface of superconducting FeS

et al. 2017

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High-temperature superconductivity occurs near antiferromagnetic instabilities and the nematic state. Debate remains on the origin of nematic order in FeSe and its relation with superconductivity. Here, we use transport, neutron scattering and Fermi surface measurements to demonstrate that hydrothermo grown superconducting FeS, an isostructure of FeSe, is a tetragonal paramagnet without nematic order and with a quasiparticle mass significantly reduced from that of FeSe. Only stripe-type spin excitations are observed up to 100 meV. No direct coupling between spin excitations and superconductivity in FeS is found, suggesting that FeS is less correlated and the nematic order in FeSe is due to competing checkerboard and stripe spin fluctuations.npj Quantum Materials (2017) 2:14 ; doi:10.1038/s41535-017-0019-6 INTRODUCTION High-transition temperature superconductivity in copper oxides and iron-based materials occurs near checkerboard and stripe antiferromagnetic (AF) instabilities, respectively. [1][2][3] Although there is also ample evidence for the existence of a nematic order, where a translationally invariant metallic phase spontaneously breaks rotational symmetry, 4-8 and for a nematic quantum critical point near optimal superconductivity in iron-based superconductors, 9, 10 much remains unclear concerning its microscopic origin and its relationship to superconductivity. 2,3 In particular, recent debates focus on whether nematic order in superconducting FeSe below the tetragonal-to-orthorhombic transition temperature T s = 91 K without static AF order 11-13 is due to competing magnetic instabilities or orbital ordering.14-22 Here, we use transport, neutron scattering and Fermi surface measurements to demonstrate that superconducting FeS, an isostructure of FeSe, 23, 24 is a tetragonal paramagnet without nematic order and with a quasiparticle mass significantly reduced from that of FeSe. Our neutron scattering experiments in the energy regime below 100 meV reveal only stripe-type spin fluctuations in FeS that are not directly coupled to superconductivity. These properties suggest that FeS is a weakly correlated analog of FeSe and, moreover, that the nematic order in FeSe is due to the frustrated magnetic interactions underlying the competing checkerboard and stripe spin fluctuations. 16-18A key to understanding the physics of the iron-based superconductors is to determine the role played by magnetism and by electronic nematicity to superconductivity. [1][2][3][5][6][7] In a typical AF ordered iron-pnictide, a tetragonal-to-orthorhombic lattice distortion T s occurs at temperatures above or at the AF ordering temperature T N , 2 and the nematic phase is observed in the paramagnetic orthorhombic phase between T s and T N . [5][6][7] Although iron chalcogenide FeSe single crystals [ Fig. 1a, b] also undergo a nematic transition at T s and become superconducting at T c = 9.3 K, 11 the low-temperature static AF ordered phase is absent. 12,13 This has fueled debates concerning the role of AF order and spin fluctuations...

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“…24,37 In the end compound FeS, quantum oscillations have revealed very light effective masses of 0.6-0.8 m e for some small orbits (below 210 T). 38 For this reason, further study of quantum oscillations in FeSe 1−x S x with higher x is desirable to establish whether critical nematic fluctuations play any role besides the effects caused by the suppression of the electronic correlations with the increased bandwidth. 11…”

Section: Fermi Surface Evolutionmentioning

confidence: 99%

Evolution of the low-temperature Fermi surface of superconducting FeSe1−xSx across a nematic phase transition

et al. 2019

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The existence of a nematic phase transition in iron-chalcogenide superconductors poses an intriguing question about its impact on superconductivity. To understand the nature of this unique quantum phase transition, it is essential to study how the electronic structure changes across this transition at low temperatures. Here, we investigate the evolution of the Fermi surfaces and electronic interactions across the nematic phase transition of FeSe 1−x S x using Shubnikov-de Haas oscillations in high magnetic fields up to 45 T in the low temperature regime down to 0.4 K. Most of the Fermi surfaces of FeSe 1−x S x monotonically increase in size except for a prominent low frequency oscillation associated with a small, but highly mobile band, which disappears at the nematic phase boundary near x~0.17, indicative of a topological Lifshitz transition. The quasiparticle masses are larger inside the nematic phase, indicative of a strongly correlated state, but they become suppressed outside it. The experimentally observed changes in the Fermi surface topology, together with the varying degree of electronic correlations, will change the balance of electronic interactions in the multi-band system FeSe 1−x S x and promote different k z-dependent superconducting pairing channels inside and outside the nematic phase.

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Upper critical field and quantum oscillations in tetragonal superconducting FeS

Cited by 15 publications

References 49 publications

Suppression of electronic correlations by chemical pressure from FeSe to FeS

Suppression of electronic correlations by chemical pressure from FeSe to FeS

Spin excitations and the Fermi surface of superconducting FeS

Evolution of the low-temperature Fermi surface of superconducting FeSe1−xSx across a nematic phase transition

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