Coexistence and Competition of the Short-Range Incommensurate Antiferromagnetic Order with the Superconducting State of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>BaFe</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ni</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Luo, Huiqian; Zhang, Rui; Laver, Mark; Yamani, Z.; Wang, Meng; Lu, Xingye; Wang, Miaoyin; Chen, Yanchao; Li, Shiliang; Chang, S.; Lynn, J. W.; Dai, Pengcheng

doi:10.1103/physrevlett.108.247002

Cited by 112 publications

(160 citation statements)

References 43 publications

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“…31 A similar behavior was recently reported for Nisubstituted crystals where also a sudden transition from a commensurate to an incommensurate AF order was observed. 66 The latter was still found to develop at T N > T c and to compete with superconductivity. From Fig.…”

Section: Resultsmentioning

confidence: 99%

Muon spin rotation study of magnetism and superconductivity in Ba(Fe1−xCox)2
Bernhard
¹
,
Wang
²
,
Nuccio
³

et al. 2012
Phys. Rev. B
54
22
87
1
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Publication date: 2012 Document VersionPublisher's PDF, also known as Version of record Link back to DTU Orbit Citation (APA): Bernhard, C., Wang, C. N., Nuccio, L., Schulz, L., Zaharko, O., Larsen, J., ... Niedermayer, C. (2012). Muon spin rotation study of magnetism and superconductivity in Using muon spin rotation (μSR) we investigated the magnetic and superconducting properties of a series of Ba(Fe 1−x Co x ) 2 As 2 single crystals with 0 x 0.15. Our study details how the antiferromagnetic order is suppressed upon Co substitution and how it coexists with superconductivity. In the nonsuperconducting samples at 0 < x < 0.04 the antiferromagnetic order parameter is only moderately suppressed. With the onset of superconductivity this suppression becomes faster and it is most rapid between x = 0.045 and 0.05. As was previously demonstrated by μSR at x = 0.055 [P. Marsik et al., Phys. Rev. Lett. 105, 57001 (2010)], the strongly weakened antiferromagnetic order is still a bulk phenomenon that competes with superconductivity. The comparison with neutron diffraction data suggests that the antiferromagnetic order remains commensurate whereas the amplitude exhibits a spatial variation that is likely caused by the randomly distributed Co atoms. A different kind of magnetic order that was also previously identified [C. Bernhard et al., New J. Phys. 11, 055050 (2009)] occurs at 0.055 < x < 0.075 where T c approaches the maximum value. The magnetic order develops here only in parts of the sample volume and it seems to cooperate with superconductivity since its onset temperature coincides with T c . Even in the strongly overdoped regime at x = 0.11, where the static magnetic order has disappeared, we find that the low-energy spin fluctuations are anomalously enhanced below T c . These findings point toward a drastic change in the relationship between the magnetic and superconducting orders from a competitive one in the strongly underdoped regime to a constructive one in near-optimally and overdoped samples.

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Section: Resultsmentioning

confidence: 99%

Muon spin rotation study of magnetism and superconductivity in Ba(Fe1−xCox)2
Bernhard
¹
,
Wang
²
,
Nuccio
³

et al. 2012
Phys. Rev. B
54
22
87
1
View full text Add to dashboard Cite

show abstract

“…1(a), we see that although the optimally electrondoped BaFe 1.9 Ni 0.1 As 2 has tetragonal structure with no static AF order 12 , it is very close to that region of the phase diagram where incommensurate static AF order coexists with superconductivity 11 . This suggests that the observed anisotropy between the in-plane (χ ′′ 110 (Q, ω)) and out-of-plane (χ ′′ 001 (Q, ω)) dynamic susceptibility in tetragonal superconducting BaFe 1.9 Ni 0.1 As 2 37 may have the same microscopic origin as the spin wave anisotropy gaps in the AF orthorhombic BaFe 2 As 2 39 .…”

Section: Discussionmentioning

confidence: 99%

“…BaFe 1.85 Ni 0.15 As 2 has a T c of 14 K, and is far away from the AF phase of the undoped BaFe 2 As 2 ( Fig.1(a)). As a function of increasing Ni-doping x, the low-temperature crystal structure of BaFe 2−x Ni x As 2 changes from orthorhombic to tetragonal with a = b for x ≥ 0.1 11,12 . For this experiment, we coaligned ∼15 g single crystals of BaFe 1.85 Ni 0.15 As 2 in the (H, H, L) scattering plane (with mosaicity 3 • at full width half maximum) with a tetragonal unit cell for which a = b = 3.96 A, and c = 12.77Å.…”

Section: Methodsmentioning

confidence: 99%

“…From the electronic phase diagram of BaFe 2−x Ni x As 2 in Fig. 1(a) 11 , we see that samples in the overdoped regime are far from the AF and superconductivity co-existence region, and thus avoid possible influence of the local magnetic anisotropy present in undoped BaFe 2 As 2 39 . For our neutron experiments, we prepared over-doped BaFe 1.85 Ni 0.15 As 2 with T c = 14 K ( Fig.…”

Section: Introductionmentioning

confidence: 99%

“…For electron-doped BaFe 2−x T x As 2 (T =Co, Ni) 3 , the antiferromagnetic (AF) and superconducting phase diagrams as a function of Co(Ni)-doping have been determined by neutron scattering experiments ( Fig. 1(a)) 10,11 . Near the optimally electron-doped superconductor BaFe 2−x Ni x As 2 at x = 0.1 (T c = 20 K), the static AF order is suppressed 12 .…”

Section: Introductionmentioning

confidence: 99%

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Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe1.85Ni0.15As

et al. 2012

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We use polarized inelastic neutron scattering to study low-energy spin excitations and their spatial anisotropy in electron-overdoped superconducting BaFe1.85Ni0.15As2 (Tc = 14 K). In the normal state, the imaginary part of the dynamic susceptibility, χ ′′ (Q, ω), at the antiferromagnetic (AF) wave vector Q = (0.5, 0.5, 1) increases linearly with energy for E ≤ 13 meV. Upon entering the superconducting state, a spin gap opens below E ≈ 3 meV and a broad neutron spin resonance appears at E ≈ 7 meV. Our careful neutron polarization analysis reveals that χ ′′ (Q, ω) is isotropic for the in-plane and out-of-plane components in both the normal and superconducting states. A comparison of these results with those of undoped BaFe2As2 and optimally electron-doped BaFe1.9Ni0.1As2 (Tc = 20 K) suggests that the spin anisotropy observed in BaFe1.9Ni0.1As2 is likely due to its proximity to the undoped BaFe2As2. Therefore, the neutron spin resonance is isotropic in the overdoped regime, consistent with a singlet to triplet excitation.

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Spin reorientation transition in Na‐doped BaFe₂As₂ studied by single‐crystal neutron diffraction

Waßer

Wurmehl

Aswartham

et al. 2016

Physica Status Solidi (b)

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Several hole‐doped BaFe2As2 compounds were recently shown to exhibit a second magnetic phase transition in the concentration range close to the full suppression of antiferromagnetic (AFM) order. At this additional transition ordered magnetic moments reorient from in‐plane to out‐of‐plane alignment associated with a suppression of the orthorhombic distortion. We have studied the magnetic properties of such a representative hole‐doped system, Ba1–xNaxFe2As2 with 0.25 ≤ x ≤ 0.40, by neutron diffraction on large single crystals. With increasing Na substitution (0.25 ≤ x ≤ 0.39) the AFM transition temperature sharply decreases, while the spin‐reorientation transition temperature is rather constant, until both magnetic phases are completely suppressed at x = 0.40. For all studied Na concentrations the additional transition is related to the spin reorientation, which, however, is complete only in the middle of the concentration range of the out‐of‐plane phase. In the superconducting state, the intensities of magnetic Bragg reflections become heavily suppressed; this effect seems to increase for larger Tc and reaches ∼50% in Ba0.61Na0.39Fe2As2. In samples with coexisting in‐plane and out‐of‐plane ordering, this superconductivity induced suppression of ordered moments is significantly stronger for the out‐of‐plane components indicating that this phase more strongly competes with superconductivity.

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Coexistence and Competition of the Short-Range Incommensurate Antiferromagnetic Order with the Superconducting State ofBaFe2−xNixAs2

Cited by 112 publications

References 43 publications

Muon spin rotation study of magnetism and superconductivity in Ba(Fe1−xCox)2
Bernhard
¹
,
Wang
²
,
Nuccio
³

et al. 2012
Phys. Rev. B
54
22
87
1
View full text Add to dashboard Cite

Muon spin rotation study of magnetism and superconductivity in Ba(Fe1−xCox)2
Bernhard
¹
,
Wang
²
,
Nuccio
³

et al. 2012
Phys. Rev. B
54
22
87
1
View full text Add to dashboard Cite

Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe1.85Ni0.15As

Spin reorientation transition in Na‐doped BaFe₂As₂ studied by single‐crystal neutron diffraction

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Coexistence and Competition of the Short-Range Incommensurate Antiferromagnetic Order with the Superconducting State ofBaFe2−xNixAs2

Cited by 112 publications

References 43 publications

Muon spin rotation study of magnetism and superconductivity in Ba(Fe1−xCox)2Bernhard1, Wang2, Nuccio3 et al. 2012Phys. Rev. B5422871View full textAdd to dashboardCite

Muon spin rotation study of magnetism and superconductivity in Ba(Fe1−xCox)2Bernhard1, Wang2, Nuccio3 et al. 2012Phys. Rev. B5422871View full textAdd to dashboardCite

Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe1.85Ni0.15As

Spin reorientation transition in Na‐doped BaFe2As2 studied by single‐crystal neutron diffraction

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Muon spin rotation study of magnetism and superconductivity in Ba(Fe1−xCox)2
Bernhard
¹
,
Wang
²
,
Nuccio
³

et al. 2012
Phys. Rev. B
54
22
87
1
View full text Add to dashboard Cite

Muon spin rotation study of magnetism and superconductivity in Ba(Fe1−xCox)2
Bernhard
¹
,
Wang
²
,
Nuccio
³

et al. 2012
Phys. Rev. B
54
22
87
1
View full text Add to dashboard Cite

Spin reorientation transition in Na‐doped BaFe₂As₂ studied by single‐crystal neutron diffraction