Preferred Magnetic Excitations in the Iron-Based 
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Guo, Jianqing; Yue, Lili; Iida, Kazuki; Kamazawa, Kazuya; Chen, Lei; Han, Tingting; Zhang, Yan; Li, Yuan

doi:10.1103/physrevlett.122.017001

Cited by 14 publications

(20 citation statements)

References 52 publications

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“…2a, as it is expected for AFM ordering with moments along c, and as it was also reported for very underdoped Sr 1−x Na x Fe 2 As 2 only. 39 Again this suggests that the AFM ordered moment and its directional pinning in Na39 is too small to significantly impact the inelastic magnetic response, see also below. The difference between the two stronger doped compounds and Na35 is also seen when tracing the single-relaxor parameters against temperature in the NS, see Fig.…”

Section: Resultsmentioning

confidence: 97%

“…29,45 The rotation of the AFM ordered moment is thus not reflected by a rotation of the polarisation of this sharp extra low-energy SRM. c polarised extra SRMs are therefore characteristic for the SC phase of FeAs-based materials, [12][13][14]16,19,39 independently on the alignment of their ordered moments.…”

Section: Resultsmentioning

confidence: 99%

“…34 For hole doped Ba 1−x K x Fe 2 AS 2 INS studies were focusing on samples with optimal and overdoped composition, 8,19,[35][36][37] where AFM order is completely suppressed, 30 or on higher energies. 38 For hole-doped Sr 1−x Na x Fe 2 As 2 a single very underdoped compo sition with low T c was studied, 39 which revealed only very weak signature of SRM's. In the underdoped hole-doped regime, there is a second magnetic phase appearing in the o-AFM dome at T reo < T N , where the magnetic moments reorient from in-plane towards out-of-plane alignment, 29,31,40 c.f.…”

Section: Introductionmentioning

confidence: 99%

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Strong spin resonance mode associated with suppression of soft magnetic ordering in hole-doped Ba1-xNaxFe2As2

et al. 2019

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Spin-resonance modes (SRM) are taken as evidence for magnetically driven pairing in Fe-based superconductors, but their character remains poorly understood. The broadness, the splitting and the spin-space anisotropies of SRMs contrast with the mostly accepted interpretation as spin excitons. We study hole-doped Ba 1−x Na x Fe 2 As 2 that displays a spin reorientation transition. This reorientation has little impact on the overall appearance of the resonance excitations with a high-energy isotropic and a low-energy anisotropic mode. However, the strength of the anisotropic low-energy mode sharply peaks at the highest doping that still exhibits magnetic ordering resulting in the strongest SRM observed in any Fe-based superconductor so far. This remarkably strong SRM is accompanied by a loss of about half of the magnetic Bragg intensity upon entering the SC phase. Anisotropic SRMs thus can allow the system to compensate for the loss of exchange energy arising from the reduced antiferromagnetic correlations within the SC state.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strong spin resonance mode associated with suppression of soft magnetic ordering in hole-doped Ba1-xNaxFe2As2

et al. 2019

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“…High-quality single crystals of Sr 0.67 Na 0.33 Fe 2 As 2 with good cleavage planes (001) were synthesized using a selfflux technique [39,49]. The temperature dependence of the in-plane resistivity, shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2As
Yang
¹
,
Huang
²
,
Zaki
³

et al. 2019
Phys. Rev. B
7
1
3
0
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We report the temperature dependent optical conductivity and angle-resolved photoemission spectroscopy (ARPES) studies of the multiband iron-based superconductor Sr0.67Na0.33Fe2As2. Measurements were made in the high-temperature tetragonal paramagnetic phase; below the structural and magnetic transitions at TN 125 K in the orthorhombic spin-density-wave (SDW)-like phase, and Tr 42 K in the reentrant tetragonal double-Q magnetic phase where both charge and SDW order exist; and below the superconducting transition at Tc 10 K. The free-carrier component in the optical conductivity is described by two Drude contributions; one strong and broad, the other weak and narrow. The broad Drude component decreases dramatically below TN and Tr, with much of its strength being transferred to a bound excitation in the mid-infrared, while the narrow Drude component shows no anomalies at either of the transitions, actually increasing in strength at low temperature while narrowing dramatically. The behavior of an infrared-active mode suggests zone-folding below Tr. Below Tc the dramatic decrease in the low-frequency optical conductivity signals the formation of a superconducting energy gap. ARPES reveals hole-like bands at the center of the Brillouin zone (BZ), with both electron-and hole-like bands at the corners. Below TN, the hole pockets at the center of the BZ decrease in size, consistent with the behavior of the broad Drude component; while below Tr the electron-like bands shift and split, giving rise to a low-energy excitation in the optical conductivity at 20 meV. The C2 and C4 magnetic states, with resulting spin-density-wave and charge-SDW order, respectively, lead to a significant reconstruction of the Fermi surface that has profound implications for the transport originating from the electron and hole pockets, but appears to have relatively little impact on the superconductivity in this material.

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“…This is reported for a large series of compounds including LiFeAs, Ba 1−x K x Fe 2 As 2 , BaFe 2 (As 1−x P x ) 2 , BaFe 2−x Co x As 2 , BaFe 2−x Ni x As 2 , Fe(Se,Te), FeSe, and Sr 1−x Na x Fe 2 As 2 . [22][23][24][25][26][27][28][29][30][31][32][33][34][35] The general property of leading c-axis polarized low-energy susceptibility is opposite to e.g. undoped BaFe 2 As 2 in the normal phase where the a-axis polarization dominates, in agreement with magnetic moments being aligned along the a axis in the spin-density wave (SDW) phase at low temperatures.…”

Section: Introductionmentioning

confidence: 90%

Effects of spin-orbit coupling on the neutron spin resonance in iron-based superconductors

Scherer¹,

Andersen²

2019

Preprint

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The so-called neutron spin resonance consists of a prominent enhancement of the magnetic response at a particular energy and momentum transfer upon entering the superconducting state of unconventional superconductors. In the case of iron-based superconductors, the neutron resonance has been extensively studied experimentally, and a peculiar spin-space anisotropy has been identified by polarized inelastic neutron scattering experiments. Here we perform a theoretical study of the energy-and spin-resolved magnetic susceptibility in the superconducting state with s+−-wave order parameter, relevant to iron-pnictide and iron-chalcogenide superconductors. Our model is based on a realistic bandstructure including spin-orbit coupling with electronic Hubbard-Hund interactions included at the RPA level. Spin-orbit coupling is taken into account both in the generation of spin-fluctuation mediated pairing, as well as the numerical computation of the spin susceptibility in the superconducting state. We find that spin-orbit coupling and superconductivity in conjunction can reproduce the salient experimentally observed features of the magnetic anisotropy of the neutron resonance. This includes the possibility of a double resonance, the tendency for a c-axis polarized resonance, and the existence of enhanced magnetic anisotropy upon entering the superconducting phase.

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Preferred Magnetic Excitations in the Iron-Based Sr1−xNaxFe2

Cited by 14 publications

References 52 publications

Strong spin resonance mode associated with suppression of soft magnetic ordering in hole-doped Ba1-xNaxFe2As2

Strong spin resonance mode associated with suppression of soft magnetic ordering in hole-doped Ba1-xNaxFe2As2

Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2As
Yang
¹
,
Huang
²
,
Zaki
³

et al. 2019
Phys. Rev. B
7
1
3
0
View full text Add to dashboard Cite

Effects of spin-orbit coupling on the neutron spin resonance in iron-based superconductors

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Preferred Magnetic Excitations in the Iron-Based Sr1−xNaxFe2

Cited by 14 publications

References 52 publications

Strong spin resonance mode associated with suppression of soft magnetic ordering in hole-doped Ba1-xNaxFe2As2

Strong spin resonance mode associated with suppression of soft magnetic ordering in hole-doped Ba1-xNaxFe2As2

Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2AsYang1, Huang2, Zaki3 et al. 2019Phys. Rev. B7130View full textAdd to dashboardCite

Effects of spin-orbit coupling on the neutron spin resonance in iron-based superconductors

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Product

Resources

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Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2As
Yang
¹
,
Huang
²
,
Zaki
³

et al. 2019
Phys. Rev. B
7
1
3
0
View full text Add to dashboard Cite