Effect of Pnictogen Height on Spin Waves in Iron Pnictides

Zhang, Chenglin; Harriger, Leland; Yin, Zhiping; Lv, Weicheng; Wang, Miaoyin; Tan, Guotai; Song, Yu; Abernathy, D. L.; Wang, Tian; Egami, T.; Haule, Kristjan; Kotliar, Gabriel; Dai, Pengcheng

doi:10.1103/physrevlett.112.217202

Cited by 69 publications

(91 citation statements)

References 44 publications

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“…such as neutron scattering [10][11][12][13][14] and / or X-Ray Scattering [15,16]. Neutron scattering experiments confirmed the presence of sizable magnetic moments in Fe pnictides (on the order of ≈ 1 µ B ) [2,3,10] with few exceptions, such as NaFeAs that shows lower ordered magnetic moment [2,3].…”

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confidence: 73%

“…3(b) we show only the values of T N and how they correlate with h F eAs [2,3,14]. In details, h F eAs increases from 1.358Å in BaFe 2 As 2 to 1.37Å in SmFeAsO and then to 1.416Å in NaFeAs, whereas T N decreases [2,3,10,14,34] as well as the magnetic bandwidth measured in our experiments and outlined in Fig. 3(c).…”

mentioning

confidence: 98%

“…The relevance of the structural parameters for SC and magnetism has been widely discussed in Refs. [2,3,14], with h F eAs and the angle of the tetrahedron formed by FeAs 4 as the main possible parameters affecting T C and T N . Since there is no SC in these parent compounds, in Fig.…”

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confidence: 99%

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Presence of magnetic excitations in SmFeAsO

Pelliciari

Dantz

Huang

et al. 2016

Applied Physics Letters

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We measured dispersive spin excitations in SmFeAsO, parent compound of SmFeAsO 1-x F x one of the highest temperature superconductors of Fe pnictides (T C ≈55 K). We determine the magnetic excitations to disperse with a bandwidth energy of ca 170 meV at (0.47, 0) and (0.34, 0.34), which merges into the elastic line approaching the Γ point. Comparing our results with other parent Fe pnictides, we show the importance of structural parameters for the magnetic excitation spectrum, with small modifications of the tetrahedron angles and As height strongly affecting the magnetism.

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confidence: 73%

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confidence: 98%

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Presence of magnetic excitations in SmFeAsO

Pelliciari

Dantz

Huang

et al. 2016

Applied Physics Letters

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“…Figures 9(e) and 9(f) compare the experimental and the combined density functional theory and dynamical mean field theory (DFT+DMFT) calculations of spin wave dispersion of NaFeAs and BaFe 2 As 2 , respectively. The outcome suggests that pnictogen height is correlated with the strength of electron-electron correlations and consequently the effective bandwidth of magnetic excitations in iron pnictides (Yin et al, 2014;Zhang et al, 2014a). Figure 10 summarizes spin wave measurements for the iron chalcogenide Fe 1+x Te Fruchart et al, 1975;Li et al, 2009d), the parent compound of the 11 family of iron-based superconductors (Lipscombe 28.5 ± 2.5 meV 7.5 ± 2.5 meV Te are sensitive to the excess iron in the interstitial sites Stock et al, 2011;Wen et al, 2011).…”

Section: A Spin Waves In the Parent Compounds Of Iron-based Superconmentioning

confidence: 99%

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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“…As Wang et al [37] pointed out, with increasing K doping, the pnitogen height relative to the Fe layer (h As ) increases. As a result, the Hund's rule coupling is enhanced [38,39], so that most of the itinerant carriers are localized at high temperature and the spectral weight transfer could not be seen from room temperature down to 5 K. Since the pnictogen height of CaKFe 4 As 4 (1.41Å) is between that of CaFe 2 As 2 (1.37Å) and KFe 2 As 2 (1.42Å), we infer that the Hund's coupling effect in CaKFe 4 As 4 also lies between that of CaFe 2 As 2 and KFe 2 As 2 .…”

Section: Spectral Weight Analysismentioning

confidence: 99%

Anomalous phonon behavior in superconducting CaKFe4As4 : An optical study

Yang

Dai

et al. 2017

Phys. Rev. B

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The temperature dependence of ab-plane optical conductivity of CaKFe4As4 has been measured below and above its superconducting transition temperature Tc ≃ 35.5 K. In the normal state, analysis with the two-Drude model reveals a T -linear scattering rate for the coherent response, which suggests strong spin-fluctuation scattering. Below the superconducting transition, the optical conductivity below 120 cm −1 vanishes, indicating nodeless gap(s). The Mattis-Bardeen fitting in the superconducting state gives two gaps of ∆1 ≃ 9 meV and ∆2 ≃ 14 meV, in good agreement with recent Angle-resolved photoemission spectroscopy (ARPES) results. In addition, around 255 cm −1 , we observe two different infrared-active Fe-As modes with obvious asymmetric lineshape, originating from strong coupling between lattice vibrations and spin or charge excitations. Considering a moderate Hund's rule coupling determined from spectral weight analysis, we propose that the strong fluctuations induced by the coupling between itinerant carriers and local moments may affect the phonon mode, and the electron-phonon coupling through the spin channel is likely to play an important role in the unconventional pairing in iron-based superconductors.

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Effect of Pnictogen Height on Spin Waves in Iron Pnictides

Cited by 69 publications

References 44 publications

Presence of magnetic excitations in SmFeAsO

Presence of magnetic excitations in SmFeAsO

Antiferromagnetic order and spin dynamics in iron-based superconductors

Anomalous phonon behavior in superconducting CaKFe4As4 : An optical study

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