Critical behavior of the spin density wave transition in underdoped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>Ba(Fe</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Co</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>)</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>x</mml:mi

Ning, Fanlong; Fu, Morgan; Torchetti, David; Imai, Takashi; Sefat, Athena S.; Cheng, Peng; Shen, Bing; Wen, H. H.

doi:10.1103/physrevb.89.214511

Cited by 24 publications

(28 citation statements)

References 44 publications

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“…Furthermore, a sign change in the electronic-magnetic Gruneisen parameter is observed for x = 0.055 and x = 0.065, consistent with the expected behavior at a QCP [14]. In addition, a critical concentration of x c ≈ 0.065 is determined from the analysis of 1/T 1 T in NMR measurements [15]. Considerably enhanced fluxflow resistivity ρ ff was also detected for x = 0.06, perhaps due to enhancement of spin fluctuations near QCP [16].…”

Section: Introductionsupporting

confidence: 60%

Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2
Liu
¹
,
Wu
²
,
Li
³

et al. 2018
Phys. Rev. B
5
1
2
0
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Bud'ko, Sergey L.; Canfield, Paul C.; Panagopoulos, C.; Li, P. G.; Mu, G.; Hu, T.; Almasan, C. C.; and Xiao, H., "Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2 near the antiferromagnetic boundary" (2018). Ames Laboratory Accepted Manuscripts. 172. https://lib.dr.iastate.edu/ameslab_manuscripts/172Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2 near the antiferromagnetic boundary AbstractSuperconductivity in iron pnictides is unconventional and pairing may be mediated by magnetic fluctuations in the Fe sublattice. Pressure is a clean method to explore superconductivity in iron based superconductors by tuning the ground state continuously without introducing disorder. Here we present a systematic high pressure transport study in Ba ( Fe 1 − x Co x ) 2 As 2 single crystals with x = 0.057, which is near the antiferromagnetic instability. Resistivity ρ = ρ 0 + A T n was studied under applied pressure up to 7.90 GPa. The parameter n approaches a minimum value of n ≈ 1 at a critical pressure P c = 3.65 GPa. Near P c , the superconducting transition temperature T c reaches a maximum value of 25.8 K. In addition, the superconducting diamagnetism at 2 K shows a sudden change around the same critical pressure. These results may be associated with a possible quantum critical point hidden inside the superconducting dome, near optimum T c . DisciplinesCondensed Matter Physics | Physics Superconductivity in iron pnictides is unconventional and pairing may be mediated by magnetic fluctuations in the Fe sublattice. Pressure is a clean method to explore superconductivity in iron based superconductors by tuning the ground state continuously without introducing disorder. Here we present a systematic high pressure transport study in Ba(Fe 1−x Co x ) 2 As 2 single crystals with x = 0.057, which is near the antiferromagnetic instability. Resistivity ρ = ρ 0 + AT n was studied under applied pressure up to 7.90 GPa. The parameter n approaches a minimum value of n ≈ 1 at a critical pressure P c = 3.65 GPa. Near P c , the superconducting transition temperature T c reaches a maximum value of 25.8 K. In addition, the superconducting diamagnetism at 2 K shows a sudden change around the same critical pressure. These results may be associated with a possible quantum critical point hidden inside the superconducting dome, near optimum T c .

show abstract

Section: Introductionsupporting

confidence: 60%

Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2
Liu
¹
,
Wu
²
,
Li
³

et al. 2018
Phys. Rev. B
5
1
2
0
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“…3d). The presence of the AFM QCP for Co-doped Ba-122 has been proposed recently by specific heat, thermal expansion, and nuclear magnetic resonance measurements181920. The observed simultaneous shift of the QCP and the maximum T c for the strained thin films suggests the relationship between critical magnetic fluctuations and superconductivity in FBS.…”

Section: Resultsmentioning

confidence: 61%

Hall-plot of the phase diagram for Ba(Fe1−xCox)2As2

Iida

Grinenko

Kurth

et al. 2016

Sci Rep

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The Hall effect is a powerful tool for investigating carrier type and density. For single-band materials, the Hall coefficient is traditionally expressed simply by , where e is the charge of the carrier, and n is the concentration. However, it is well known that in the critical region near a quantum phase transition, as it was demonstrated for cuprates and heavy fermions, the Hall coefficient exhibits strong temperature and doping dependencies, which can not be described by such a simple expression, and the interpretation of the Hall coefficient for Fe-based superconductors is also problematic. Here, we investigate thin films of Ba(Fe1−xCox)2As2 with compressive and tensile in-plane strain in a wide range of Co doping. Such in-plane strain changes the band structure of the compounds, resulting in various shifts of the whole phase diagram as a function of Co doping. We show that the resultant phase diagrams for different strain states can be mapped onto a single phase diagram with the Hall number. This universal plot is attributed to the critical fluctuations in multiband systems near the antiferromagnetic transition, which may suggest a direct link between magnetic and superconducting properties in the BaFe2As2 system.

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“…This originates from a sudden suppression of AFM spin fluctuations in the AFM state and a reduction of the density of states D(E F ) at the Fermi energy due to a reconstruction of Fermi surface below T S . 48,51 The temperature dependence of 1/T 1 T is quite different from that of 1/T 1 T in Ba(Fe 1−x Co x ) 2 As 2 . In Fig.…”

mentioning

confidence: 99%

“…6(d), the 1/T 1 T data for the 2.3% Co substituted CaFe 2 As 2 are also compared with those for x = 0.02 (non-SC) in Ba(Fe 1−x Co x ) 2 As 2 (Ref. 51) with T N = 99 K close to T N = 106 K of the 2.3% Co substituted CaFe 2 As 2 . We again see similar differences in the temperature dependence of 1/T 1 T between the samples.…”

mentioning

confidence: 99%

Antiferromagnetic spin correlations and pseudogaplike behavior inCa(Fe1−xCox)2As2studied by<

et al. 2015

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We report 75 As nuclear magnetic resonance (NMR) measurements of single-crystalline Ca(Fe1−xCox)2As2 (x = 0.023, 0.028, 0.033, and 0.059) annealed at 350• C for 7 days. From the observation of a characteristic shape of 75 As NMR spectra in the stripe-type antiferromagnetic (AFM) state, as in the case of x = 0 (TN = 170 K), clear evidence for the commensurate AFM phase transition with the concomitant structural phase transition is observed in x = 0.023 (TN = 106 K) and x = 0.028 (TN = 53 K). Through the temperature dependence of the Knight shifts and the nuclear spin lattice relaxation rates (1/T1), although stripe-type AFM spin fluctuations are realized in the paramagnetic state as in the case of other iron pnictide superconductors, we found a gradual decrease of the AFM spin fluctuations below a crossover temperature T * which was nearly independent of Co-substitution concentration, and is attributed to a pseudogap-like behavior in the spin excitation spectra of these systems. The T * feature finds correlation with features in the temperature-dependent inter-plane resistivity, ρc(T ), but not with the in-plane resistivity ρa(T ). The temperature evolution of anisotropic stripe-type AFM spin fluctuations are tracked in the paramagnetic and pseudogap phases by the 1/T1 data measured under magnetic fields parallel and perpendicular to the c axis. Based on our NMR data, we have added a pseudogap-like phase to the magnetic and electronic phase diagram of Ca(Fe1−xCox)2As2.

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Critical behavior of the spin density wave transition in underdopedBa(Fe1−xCox)2As2(x

Cited by 24 publications

References 44 publications

Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2
Liu
¹
,
Wu
²
,
Li
³

et al. 2018
Phys. Rev. B
5
1
2
0
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Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2
Liu
¹
,
Wu
²
,
Li
³

et al. 2018
Phys. Rev. B
5
1
2
0
View full text Add to dashboard Cite

Hall-plot of the phase diagram for Ba(Fe1−xCox)2As2

Antiferromagnetic spin correlations and pseudogaplike behavior inCa(Fe1−xCox)2As2studied by<

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Critical behavior of the spin density wave transition in underdopedBa(Fe1−xCox)2As2(x

Cited by 24 publications

References 44 publications

Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2Liu1, Wu2, Li3 et al. 2018Phys. Rev. B5120View full textAdd to dashboardCite

Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2Liu1, Wu2, Li3 et al. 2018Phys. Rev. B5120View full textAdd to dashboardCite

Hall-plot of the phase diagram for Ba(Fe1−xCox)2As2

Antiferromagnetic spin correlations and pseudogaplike behavior inCa(Fe1−xCox)2As2studied by<

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Product

Resources

About

Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2
Liu
¹
,
Wu
²
,
Li
³

et al. 2018
Phys. Rev. B
5
1
2
0
View full text Add to dashboard Cite

Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2
Liu
¹
,
Wu
²
,
Li
³

et al. 2018
Phys. Rev. B
5
1
2
0
View full text Add to dashboard Cite