59Co and 75As NMR Investigation of Electron-Doped High Tc Superconductor BaFe1.8Co0.2As2 (Tc = 22 K)

Ning, Fanlong; Ahilan, K.; Imai, Takashi; Sefat, Athena S.; McGuire, Michael A.; Sales, B. C.; Mandrus, David

doi:10.1143/jpsj.77.103705

Cited by 123 publications

(184 citation statements)

References 16 publications

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“…Fig. 6 shows the temperature dependence the induced magnetization of Ba(Fe 1−x Co x ) 2 As 2 (x=0.065) for µ 0 H = 9 T. The temperature dependence shows the characteristic Yosida dependence expected for singlet pairing 42 , this is consistent with measurements of the NMR Knight shift in the same compound 36,37 . There is a large susceptibility in the T → 0 limit.…”

Section: A Resultssupporting

confidence: 78%

“…SQUID magnetometery, because of the presence of a large diamagnetic contribution. Polarized neutron diffraction and NMR Knight shift measurements 36,37 can be used to make magnetization measurements in the mixed state. The polarized neutron diffraction technique used here is unique because it directly measures the total magnetization including spin and orbital contributions.…”

Section: Temperature and Field Dependence Of The Magnetizationmentioning

confidence: 99%

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Polarized neutron diffraction study of the field-induced magnetization in the normal and superconducting states of Ba(Fe1−xCox)
Lester
¹
,
Chu
²
,
Analytis
³

et al. 2011
Phys. Rev. B

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Section: A Resultssupporting

confidence: 78%

Section: Temperature and Field Dependence Of The Magnetizationmentioning

confidence: 99%

Polarized neutron diffraction study of the field-induced magnetization in the normal and superconducting states of Ba(Fe1−xCox)
Lester
¹
,
Chu
²
,
Analytis
³

et al. 2011
Phys. Rev. B

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“…The temperature dependence of the field-induced magnetization shows a clear drop below T c in nearly optimally electron-doped BaFe 1.87 Co 0.13 As 2 [ Fig. 31(b)] (Lester et al, 2011), consistent with measurements of the NMR Knight shift in the same compound (Ning et al, 2008;Oh et al, 2011). The large residual contribution of the field induced magnetization below T c seen in both V 3 Si (Shull and Wedgewood, 1966) and BaFe 1.87 Co 0.13 As 2 (Lester et al, 2011) has been attributed to the van Vleck or orbital contribution to the susceptibility.…”

Section: F Neutron Polarization Analysis Of Spin Excitation Anisotrosupporting

confidence: 77%

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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“…69 However, such a spin-triplet state does not seem to be realized in Ba(Fe 1−x Co x ) 2 As 2 for which NMR Knight shift measurements revealed a pronounced superconductivityinduced reduction of the Knight shift that is a hallmark of a spin-singlet superconducting state. 70,71 Therefore, it appears that alternative explanations for the enhanced spin correlations in the superconducting state of optimally doped and overdoped Ba(Fe 1−x Co x ) 2 As 2 need to be explored. This issue is beyond the scope of our present μSR study.…”

Section: Superconductivity-induced Enhancement Of Spin Fluctuationmentioning

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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⁵⁹Co and ⁷⁵As NMR Investigation of Electron-Doped High T_c Superconductor BaFe_1.8Co_0.2As₂ (T_c = 22 K)

Cited by 123 publications

References 16 publications

Polarized neutron diffraction study of the field-induced magnetization in the normal and superconducting states of Ba(Fe1−xCox)
Lester
¹
,
Chu
²
,
Analytis
³

et al. 2011
Phys. Rev. B

Polarized neutron diffraction study of the field-induced magnetization in the normal and superconducting states of Ba(Fe1−xCox)
Lester
¹
,
Chu
²
,
Analytis
³

et al. 2011
Phys. Rev. B

Antiferromagnetic order and spin dynamics in iron-based superconductors

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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59Co and 75As NMR Investigation of Electron-Doped High Tc Superconductor BaFe1.8Co0.2As2 (Tc = 22 K)

Cited by 123 publications

References 16 publications

Polarized neutron diffraction study of the field-induced magnetization in the normal and superconducting states of Ba(Fe1−xCox)Lester1, Chu2, Analytis3 et al. 2011Phys. Rev. B

Polarized neutron diffraction study of the field-induced magnetization in the normal and superconducting states of Ba(Fe1−xCox)Lester1, Chu2, Analytis3 et al. 2011Phys. Rev. B

Antiferromagnetic order and spin dynamics in iron-based superconductors

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

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⁵⁹Co and ⁷⁵As NMR Investigation of Electron-Doped High T_c Superconductor BaFe_1.8Co_0.2As₂ (T_c = 22 K)

Polarized neutron diffraction study of the field-induced magnetization in the normal and superconducting states of Ba(Fe1−xCox)
Lester
¹
,
Chu
²
,
Analytis
³

et al. 2011
Phys. Rev. B

Polarized neutron diffraction study of the field-induced magnetization in the normal and superconducting states of Ba(Fe1−xCox)
Lester
¹
,
Chu
²
,
Analytis
³

et al. 2011
Phys. Rev. B

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