Effect of gap anisotropy on the spin resonance peak in the superconducting state of iron-based materials

Korshunov, M. M.

doi:10.1103/physrevb.98.104510

Cited by 17 publications

(13 citation statements)

References 90 publications

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“…In the superconducting state, a clear spin-resonance is observed around the stripe-type wave vectors [144] (see Figure 7a,d, later confirmed in an experiment on detwinned FeSe; Figure 7g), showing a consistent behavior in energy and momentum with a spin-fluctuation-mediated superconducting pairing mechanism [162,219,220]. Polarized neutron measurements found that low-energy magnetic fluctuations, including the superconducting resonance, are mainly along the c-axis [158].…”

Section: Spin Fluctuations In Superconducting Statesupporting

confidence: 57%

On the Remarkable Superconductivity of FeSe and Its Close Cousins

2020

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Emergent electronic phenomena in iron-based superconductors have been at the forefront of condensed matter physics for more than a decade. Much has been learned about the origins and intertwined roles of ordered phases, including nematicity, magnetism, and superconductivity, in this fascinating class of materials. In recent years, focus has been centered on the peculiar and highly unusual properties of FeSe and its close cousins. This family of materials has attracted considerable attention due to the discovery of unexpected superconducting gap structures, a wide range of superconducting critical temperatures, and evidence for nontrivial band topology, including associated spin-helical surface states and vortex-induced Majorana bound states. Here, we review superconductivity in iron chalcogenide superconductors, including bulk FeSe, doped bulk FeSe, FeTe1−xSex, intercalated FeSe materials, and monolayer FeSe and FeTe1−xSex on SrTiO3. We focus on the superconducting properties, including a survey of the relevant experimental studies, and a discussion of the different proposed theoretical pairing scenarios. In the last part of the paper, we review the growing recent evidence for nontrivial topological effects in FeSe-related materials, focusing again on interesting implications for superconductivity.

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Section: Spin Fluctuations In Superconducting Statesupporting

confidence: 57%

On the Remarkable Superconductivity of FeSe and Its Close Cousins

2020

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“…It is important to note that the choice of coupling mechanism limits the typology of order parameter obtainable; in the specific case of IBS and of AFM spin fluctuations the only order parameter symmetry allowed is s ± [11,35]. This specific state was chosen for the theoretical analysis because most experimental data point towards it [36][37][38] and we find it is compatible with our data as well.…”

Section: E Eliashberg Modelingsupporting

confidence: 71%

Analysis of the London penetration depth in Ni-doped CaKFe4As4

et al. 2019

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We report combined experimental and theoretical analysis of superconductivity in CaK(Fe1−xNix)4As4 (CaK1144) for x=0, 0.017, and 0.034. To obtain the superfluid density ρ=[1+ΔλL(T)/λL(0)]−2, the temperature dependence of the London penetration depth ΔλL(T) was measured by using a tunnel-diode resonator (TDR) and the results agreed with the microwave coplanar resonator (MWR) with the small differences accounted for by considering a three orders of magnitude higher frequency of MWR. The absolute value of λL(T≪Tc)≈λL(0) was measured by using MWR, λL(5K)≈170±20 nm, which agreed well with the NV centers in diamond optical magnetometry that gave λL(5K)≈196±12 nm, which agreed well with the NV centers in diamond optical magnetometry that gave λL(5K)≈196±12 nm. The experimental results are analyzed within the Eliashberg theory, showing that the superconductivity of CaK1144 is well described by the nodeless s± order parameter and that upon Ni doping the interband interaction increases.

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“…Notice that the hyperfine field adds to zero along the orange lines and is finite along the green lines. NaFe 1−x Co x As, although the spin density wave itself has a zero-average magnetic moment along all crystalline directions and both phenomena occur in different parts of the Fermi surface [63][64][65]. The behavior we find here has not been observed in the iron-pnictide superconducting family, as it directly connects the anisotropic structure of the local magnetic order with the anisotropic superconducting gap.…”

Section: (C) Right Panel]mentioning

confidence: 54%

Anisotropic superconductivity in the spin-vortex antiferromagnetic superconductor CaK(Fe0.95Ni0.05)4As4

et al. 2021

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High critical temperature superconductivity often occurs in systems where an antiferromagnetic order is brought near T = 0 K by slightly modifying pressure or doping. CaKFe 4 As 4 is a superconducting, stoichiometric iron-pnictide compound showing optimal superconducting critical temperature with T c as large as 35 K. Doping with Ni induces a decrease in T c and the onset of spin-vortex crystal (SVC) antiferromagnetic order, which consists of spins pointing inwards to or outwards from alternating As sites on the diagonals of the in-plane square Fe lattice. Here we study the band structure of CaK(Fe 0.95 Ni 0.05 ) 4 As 4 (T c = 10 K, T SV C = 50 K) using quasiparticle interference with a scanning tunneling microscope and show how the SVC modifies the band structure and induces a fourfold superconducting gap anisotropy.

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Effect of gap anisotropy on the spin resonance peak in the superconducting state of iron-based materials

Cited by 17 publications

References 90 publications

On the Remarkable Superconductivity of FeSe and Its Close Cousins

On the Remarkable Superconductivity of FeSe and Its Close Cousins

Analysis of the London penetration depth in Ni-doped CaKFe4As4

Anisotropic superconductivity in the spin-vortex antiferromagnetic superconductor CaK(Fe0.95Ni0.05)4As4

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