Non-Fermi liquid transport in the vicinity of the nematic quantum critical point of superconducting 
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Huang, Wantong; Hosoi, Suguru; Čulo, Matija; Kasahara, S.; Sato, Yuki; Matsuura, Kohei; Mizukami, Y.; Berben, Maarten; Hussey, N. E.; Kontani, Hiroshi; Shibauchi, T.; Matsuda, Yuji

doi:10.1103/physrevresearch.2.033367

Cited by 36 publications

(26 citation statements)

References 38 publications

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“…Thus, the absence of enhanced T c near the nematic end point does not immediately rule out the important role of nematic fluctuations in this system. It has also been suggested that nematic fluctuations could be quenched by the strong coupling to the lattice or local strain effects in FeSe 1− x S x from quantum oscillation studies showing the absence of mass divergence near the nematic end point 27 , although the non-Fermi liquid behaviors are found in transport properties 28 , 29 . This situation calls for a different system to study the relationship between nematicity and superconductivity.…”

Section: Introductionmentioning

confidence: 99%

High-pressure phase diagrams of FeSe1−xTex: correlation between suppressed nematicity and enhanced superconductivity

et al. 2021

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The interplay among magnetism, electronic nematicity, and superconductivity is the key issue in strongly correlated materials including iron-based, cuprate, and heavy-fermion superconductors. Magnetic fluctuations have been widely discussed as a pairing mechanism of unconventional superconductivity, but recent theory predicts that quantum fluctuations of nematic order may also promote high-temperature superconductivity. This has been studied in FeSe1−xSx superconductors exhibiting nonmagnetic nematic and pressure-induced antiferromagnetic orders, but its abrupt suppression of superconductivity at the nematic end point leaves the nematic-fluctuation driven superconductivity unconfirmed. Here we report on systematic studies of high-pressure phase diagrams up to 8 GPa in high-quality single crystals of FeSe1−xTex. When Te composition x(Te) becomes larger than 0.1, the high-pressure magnetic order disappears, whereas the pressure-induced superconducting dome near the nematic end point is continuously found up to x(Te) ≈ 0.5. In contrast to FeSe1−xSx, enhanced superconductivity in FeSe1−xTex does not correlate with magnetism but with the suppression of nematicity, highlighting the paramount role of nonmagnetic nematic fluctuations for high-temperature superconductivity in this system.

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Section: Introductionmentioning

confidence: 99%

High-pressure phase diagrams of FeSe1−xTex: correlation between suppressed nematicity and enhanced superconductivity

et al. 2021

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“…On the other hand, inside the nematic phase of FeSe 1−x S x , Kohler's rule is violated and the magnetoresistance of FeSe 1−x S x , follows an unusual B ∼1.55 power law in high magnetic fields [28]. Furthermore, scaling to a modified Kohler's rule as a function of the Hall angle was found in the vicinity of the nematic end point [123]. Another way to understand this complex behavior is to separate different components of magnetoresistance, as suggested in Ref.…”

Section: Magnetotransport Behaviour Of Fese 1−x S Xmentioning

confidence: 93%

Electronic Nematic States Tuned by Isoelectronic Substitution in Bulk FeSe1−xSx

Coldea

2021

Front. Phys.

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Isoelectronic substitution is an ideal tuning parameter to alter electronic states and correlations in iron-based superconductors. As this substitution takes place outside the conducting Fe planes, the electronic behaviour is less affected by the impurity scattering experimentally and relevant key electronic parameters can be accessed. In this short review, I present the experimental progress made in understanding the electronic behaviour of the nematic electronic superconductors, FeSe1−xSx. A direct signature of the nematic electronic state is in-plane anisotropic distortion of the Fermi surface triggered by orbital ordering effects and electronic interactions that result in multi-band shifts detected by ARPES. Upon sulphur substitution, the electronic correlations and the Fermi velocities decrease in the tetragonal phase. Quantum oscillations are observed for the whole series in ultra-high magnetic fields and show a complex spectra due to the presence of many small orbits. Effective masses associated to the largest orbit display non-divergent behaviour at the nematic end point (x ∼ 0.175(5)), as opposed to critical spin-fluctuations in other iron pnictides. Magnetotransport behaviour has a strong deviation from the Fermi liquid behaviour and linear T resistivity is detected at low temperatures inside the nematic phase, where scattering from low energy spin-fluctuations are likely to be present. The superconductivity is not enhanced in FeSe1−xSx and there are no divergent electronic correlations at the nematic end point. These manifestations indicate a strong coupling with the lattice in FeSe1−xSx and a pairing mechanism likely promoted by spin fluctuations.

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“…Explaining these phase diagrams in detail, taking advantage of simultaneous transport and thermodynamic data, and using de Haas-van Alphen oscillation data to carefully account for the multi-band nature of many of these systems, is likely to provide strong constraints on theories of the underlying scattering. In this review we have not touched upon the rich phenomenology of magnetotransport [201][202][203][204][205][206][207][208] and low temperature thermal [209] and thermoelectric [210,211] transport that has also been demonstrated experimentally in Planckian systems. These will likely also provide fruitful hunting ground for future theories.…”

Section: Implications Of a Bound On Dissipationmentioning

confidence: 99%

Planckian Dissipation in Metals

Hartnoll,

Mackenzie

2021

Preprint

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We review the appearance of the Planckian time τ Pl = /(k B T ) in both conventional and unconventional metals. We give a pedagogical discussion of the various different timescales (quasiparticle, transport, many-body) that characterize metals, emphasizing conditions under which these times are the same or different. Throughout, we have attempted to clear up aspects of the problem that had been confusing us, in the hope that this helps the reader as well. We discuss the possibility of a Planckian bound on dissipation from both a quasiparticle and a many-body perspective. Planckian quasiparticles can arise naturally from a combination of inelastic scattering and mass renormalization.Many-body dynamics, on the other hand, is constrained by the basic time-and lengthscales of local thermalization.

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Non-Fermi liquid transport in the vicinity of the nematic quantum critical point of superconducting FeSe1−xSx

Cited by 36 publications

References 38 publications

High-pressure phase diagrams of FeSe1−xTex: correlation between suppressed nematicity and enhanced superconductivity

High-pressure phase diagrams of FeSe1−xTex: correlation between suppressed nematicity and enhanced superconductivity

Electronic Nematic States Tuned by Isoelectronic Substitution in Bulk FeSe1−xSx

Planckian Dissipation in Metals

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