Degradation of Superconductivity and Spin Fluctuations by Electron Overdoping in LaFeAsO1-xFx

Wakimoto, Shuichi; Kodama, Kazuhisa; Ishikado, M.; Matsuda, Masaaki; Kajimoto, Ryoichi; Arai, M.; Kakurai, Kazuhisa; Esaka, Fumitaka; Iyo, A.; Kitô, Hijiri; Eisaki, H.; Shamoto, S.

doi:10.1143/jpsj.79.074715

Cited by 58 publications

(49 citation statements)

References 30 publications

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“…12(a)]. Similar measurements on powder samples of LaFeAsO 1−x F x (Ishikado et al, 2009;Shamoto et al, 2010;Wakimoto et al, 2010) and molecular-intercalated FeSe (Taylor et al, 2013) also revealed resonance like spin excitations below T c . Figure 12(c) shows temperature de-TABLE II Comparison of the effective magnetic exchange couplings for parent compounds of copper-based and iron-based superconductors.…”

Section: B Neutron Spin Resonance and Its Relationship With Superconsupporting

confidence: 58%

Antiferromagnetic order and spin dynamics in iron-based superconductors

2015

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High-transition temperature (high-Tc) superconductivity in the iron pnictides/chalcogenides emerges from the suppression of the static antiferromagnetic order in their parent compounds, similar to copper oxides superconductors. This raises a fundamental question concerning the role of magnetism in the superconductivity of these materials. Neutron scattering, a powerful probe to study the magnetic order and spin dynamics, plays an essential role in determining the relationship between magnetism and superconductivity in high-Tc superconductors. The rapid development of modern neutron time-of-flight spectrometers allows a direct determination of the spin dynamical properties of iron-based superconductors throughout the entire Brillouin zone. In this review, we present an overview of the neutron scattering results on iron-based superconductors, focusing on the evolution of spin excitation spectra as a function of electron/hole-doping and isoelectronic substitution. We compare spin dynamical properties of iron-based superconductors with those of copper oxide and heavy fermion superconductors, and discuss the common features of spin excitations in these three families of unconventional superconductors and their relationship with superconductivity.

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Section: B Neutron Spin Resonance and Its Relationship With Superconsupporting

confidence: 58%

Antiferromagnetic order and spin dynamics in iron-based superconductors

2015

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“…This is consistent with the observation of spin fluctuations in the optimally electron-doped 1111 system LaFeAsO 1−x F x using inelastic neutron scattering. 20 In summary, we have successfully observed chargeexcitation features in the RIXS spectrum of an iron pnictide, PrFeAsO 1−y (y=0,0.3). Calculations based on a 16 band dp model best reproduce the momentum dependence of the experimental dd interband feature for U =2.4 eV and J=0.48 eV, which confirms that the 1111 pnictides are moderately correlated.…”

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confidence: 74%

Resonant inelastic x-ray scattering study of charge excitations in superconducting and nonsuperconducting PrFeAsO1−y

et al. 2012

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“…The gap temperature dependences measured in [28,29] using point-contact Andreev spectroscopy (PCAR) are typical for a strong interband coupling. A number of inelastic neutron scattering probes [35][36][37][38] reported rather sharp magnetic resonance peak in favor of the s ± model [15,16]. Nonetheless, the experimentally observed magnetic resonance peak seems [13,14] not so pronounced as predicted for s ± , and the s ± system would be unstable in a presence of impurities [13,39].…”

Section: Introductionmentioning

confidence: 95%

On the structure of the superconducting order parameter in high-temperature Fe-based superconductors

Kuzmicheva¹,

Muratov²,

Kuzmichev³

et al. 2017

Phys.-Usp.

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We discuss the synthesis, characterization, and comprehensive study of Ba-122 single crystals with various substitutions and various superconducting transition temperatures. We use five complementary techniques to obtain a self-consistent set of data on the superconducting properties of Ba-122. A major conclusion of our work is the coexistence of two superconducting condensates differing in the electron–boson coupling strength. The two gaps that develop in distinct Fermi surface sheets are nodeless in the kxky plane and exhibit s-wave symmetry; the two-band model suffices for the description of the main parameters of the superconducting state. A moderate interband coupling and a considerable Coulomb repulsion in the description of the two-gap superconducting state of barium pnictides favor the s++ model.

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Degradation of Superconductivity and Spin Fluctuations by Electron Overdoping in LaFeAsO_1-xF_x

Cited by 58 publications

References 30 publications

Antiferromagnetic order and spin dynamics in iron-based superconductors

Antiferromagnetic order and spin dynamics in iron-based superconductors

Resonant inelastic x-ray scattering study of charge excitations in superconducting and nonsuperconducting PrFeAsO1−y

On the structure of the superconducting order parameter in high-temperature Fe-based superconductors

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