Persistent correlation between superconductivity and antiferromagnetic fluctuations near a nematic quantum critical point in 
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Wiecki, Paul; Rana, Khusboo; Böhmer, Anna E.; Lee, Y.; Bud’ko, Sergey L.; Canfield, Paul C.; Furukawa, Yuji

doi:10.1103/physrevb.98.020507

Cited by 49 publications

(81 citation statements)

References 51 publications

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“…In order to identify possible sources of scattering responsible for these changes, we consider the role of spin fluctuations. Recent NMR data found that anti-ferromagnetic spin fluctuations are present inside the nematic phase of FeSe 1−x S x , being strongest around x ∼ 0.1 [37]. In FeSe, spin fluctuations are rather anisotropic [37,38] and strongly field-dependent below 15 K [11].…”

Section: Resultsmentioning

confidence: 99%

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Anomalous high-magnetic field electronic state of the nematic superconductors FeSe1−xSx

Bristow

Reiss

Haghighirad

et al. 2020

Phys. Rev. Research

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Understanding superconductivity requires detailed knowledge of the normal electronic state from which it emerges. A nematic electronic state that breaks the rotational symmetry of the lattice can potentially promote unique scattering relevant for superconductivity. Here, we investigate the normal transport of superconducting FeSe1−xSx across a nematic phase transition using high magnetic fields up to 69 T to establish the temperature and field-dependencies. We find that the nematic state is an anomalous non-Fermi liquid, dominated by a linear resistivity at low temperatures that can transform into a Fermi liquid, depending on the composition x and the impurity level. Near the nematic end point, we find an extended temperature regime with ∼ T 1.5 resistivity. The transverse magnetoresistance inside the nematic phase has as a ∼ H 1.55 dependence over a large magnetic field range and it displays an unusual peak at low temperatures inside the nematic phase. Our study reveals anomalous transport inside the nematic phase, driven by the subtle interplay between the changes in the electronic structure of a multi-band system and the unusual scattering processes affected by large magnetic fields and disorder.Magnetic field is a unique tuning parameter that can suppress superconductivity to reveal the normal low-temperature electronic behavior of many unconventional superconductors [1,2]. High-magnetic fields can also induce new phases of matter, probe Fermi surfaces and determine the quasi-particle masses from quantum oscillations in the proximity of quantum critical points [1,3]. In unconventional superconductors, close to antiferromagnetic critical regions, an unusual scaling between a linear resistivity in temperature and magnetic fields was found [4,5]. Magnetic fields can also induce metal-toinsulator transitions, as in hole-doped cuprates, where superconductivity emerges from an exotic electronic ground state [2].FeSe is a unique bulk superconductor with T c ∼ 9 K which displays a variety of complex and competing electronic phases [6]. FeSe is a bad metal at room temperature and it enters a nematic electronic state below T s ∼ 87 K. This nematic phase is characterized by multi-band shifts driven by orbital ordering that lead to Fermi surface distortions [6,7]. Furthermore, the electronic ground state is that of a strongly correlated system and the quasiparticle masses display orbital-dependent enhancements [7,8]. FeSe shows no long-range magnetic order at ambient pressure, but complex magnetic fluctuations are present at high energies over a large temperature range [9]. Below T s , the spin-lattice relaxation rate from NMR experiments is enhanced as it captures the low-energy tail of the stripe spin-fluctuations [10,11]. Furthermore, recent µSR studies invoke the close proximity of FeSe to a magnetic quantum critical point as the muon relaxation rate shows unusual temperature dependence inside the nematic state [12].The changes in the electronic structure and magnetic fluctuations of FeSe can have profound implicatio...

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Section: Resultsmentioning

confidence: 99%

“…[30,33] the nominal, x nom were can be at least 80% less than the real x (see also Ref. [3,17,37]). The structural transition at T s also provides useful information about the expected x value, as shown in Fig.S1.…”

Section: Methodsmentioning

confidence: 97%

Anomalous high-magnetic field electronic state of the nematic superconductors FeSe1−xSx

Bristow

Reiss

Haghighirad

et al. 2020

Phys. Rev. Research

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“…This correlation between the band renormalisation and T c was also captured by quantum oscillations experiments and ARPES studies on FeSe 1−x S x [18,19]. Furthermore, NMR studies show that the strength of antiferromagnetic fluctuations also correlates with T c within the nematic phase, being suppressed together with the nematicity [36,42]. For higher pressures, the correlation between the hole-like band masses and T c is lost, suggesting changes in the pairing mechanism towards the high-T c phase.…”

mentioning

confidence: 85%

Quenched nematic criticality and two superconducting domes in an iron-based superconductor

et al. 2019

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The nematic electronic state and its associated nematic critical fluctuations have emerged as potential candidates for superconducting pairing in various unconventional superconductors. However, in most materials their coexistence with other magnetically-ordered phases poses significant challenges in establishing their importance. Here, by combining chemical and hydrostatic physical pressure in FeSe0.89S0.11, we provide a unique access to a clean nematic quantum phase transition in the absence of a long-range magnetic order. We find that in the proximity of the nematic phase transition, there is an unusual non-Fermi liquid behavior in resistivity at high temperatures that evolves into a Fermi liquid behaviour at the lowest temperatures. From quantum oscillations in high magnetic fields, we trace the evolution of the Fermi surface and electronic correlations as a function of applied pressure. We detect experimentally a Lifshitz transition that separates two distinct superconducting regions: one emerging from the nematic electronic phase with a small Fermi surface and strong electronic correlations and the other one with a large Fermi surface and weak correlations that promotes nesting and stabilization of a magnetically-ordered phase at high pressures. The lack of mass divergence suggests that the nematic critical fluctuations are quenched by the strong coupling to the lattice. This establishes that superconductivity is not enhanced at the nematic quantum phase transition in the absence of magnetic order.

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“…At x ≈ 0.17, T s vanishes and the nematic susceptibility diverges, indicating the presence of a nematic QCP [27]. The AFM fluctuations are also suppressed by the substitution and no sizable AFM fluctuations are observed near the nematic QCP [28].…”

Section: Introductionmentioning

confidence: 97%

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

Huang

Hosoi

Čulo³

et al. 2020

Phys. Rev. Research

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Non-Fermi liquids are strange metals whose physical properties deviate qualitatively from those of conventional metals due to strong quantum fluctuations. In this paper, we report transport measurements on the FeSe 1−x S x superconductor, which has a quantum critical point of a nematic order without accompanying antiferromagnetism. We find that in addition to a linear-in-temperature resistivity ρ xx ∝ T , which is close to the Planckian limit, the Hall angle varies as cot θ H ∝ T 2 and the low-field magnetoresistance is well scaled as ρ xx /ρ xx ∝ tan 2 θ H in the vicinity of the nematic quantum critical point. This set of anomalous charge transport properties show striking resemblance with those reported in cuprate, iron-pnictide, and heavy fermion superconductors, demonstrating that the critical fluctuations of a nematic order with q ≈ 0 can also lead to a breakdown of the Fermi liquid description.

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Persistent correlation between superconductivity and antiferromagnetic fluctuations near a nematic quantum critical point in FeSe1−xSx

Cited by 49 publications

References 51 publications

Anomalous high-magnetic field electronic state of the nematic superconductors FeSe1−xSx

Anomalous high-magnetic field electronic state of the nematic superconductors FeSe1−xSx

Quenched nematic criticality and two superconducting domes in an iron-based superconductor

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

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