Signatures of quantum criticality in the thermopower of Ba(Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>Co<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mi>x</mml:mi></mml:msub></mml:math>)<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mm

Arsenijević, Stevan; Hodovanets, Halyna; Gáal, R.; Forró, Lászlø; Bud’ko, Sergey L.; Canfield, Paul C.

doi:10.1103/physrevb.87.224508

Cited by 33 publications

(33 citation statements)

References 80 publications

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“…The latter finding also provides the motivation to investigate whether these phases may be governed by the system's proximity to a putative quantum critical point (QCP) [4][5][6]. Recently, the co-existence of superconductivity and spin-density wave (SDW) phases has been further confirmed by NMR measurements, in which a spin glass phase is revealed between x = 0.06 and 0.071 [7].…”

Section: Introductionmentioning

confidence: 93%

Universality and unconventional enhancement of flux-flow resistivity in Ba(Fe1−xCox)2As2

Huang¹,

Haney²,

Singh³

et al. 2017

Phys. Rev. B

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Measurements of the current-voltage characteristics (I-V ) were performed on Ba(Fe1−xCox)2As2 single crystals with doping level 0.044 ≤ x ≤ 0.1. An unconventional increase in the flux-flow resistivity ρ ff with decreasing magnetic field H was observed across this doping range. Such an abnormal field dependence of ρ ff is in contrast with the linear ρ ff (H) of conventional type-II superconductors, but similar to the behavior recently observed in the heavy-fermion superconductor CeCoIn5. A significantly enhanced ρ ff was found for the x = 0.06 single crystals, implying a strong single-particle energy dissipation around the vortex cores. At different temperatures and fields and for a given doping concentration, the normalized ρ ff scales with normalized field and temperature. The doping level dependence of these parameters strongly suggests that the abnormal upturn in ρ ff is likely related to the enhancement of spin fluctuations around the vortex cores of the samples with x ≈ 0.06.

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Section: Introductionmentioning

confidence: 93%

Universality and unconventional enhancement of flux-flow resistivity in Ba(Fe1−xCox)2As2

Huang¹,

Haney²,

Singh³

et al. 2017

Phys. Rev. B

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“…For this concentration the T s /T m ''lines'' coincide with the T c ''line,'' near optimal substitution and the highest T c . This feature might be associated with significant changes of the electronic structure or other correlations as well as possible quantum critical fluctuations [21].…”

Section: Philosophical Magazinementioning

confidence: 99%

Thermoelectric power of Ba(Fe_1−xCo_x)₂As₂(0 ≤ x ≤ 0.05) and Ba(Fe_1−xRh_x)₂As₂(0 ≤ x ≤ 0.171)

Hodovanets

Thaler

Mun

et al. 2013

Philosophical Magazine

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“…The two are completely different. Most prominently, the hotspot picture 8,[10][11][12] is no longer valid if forward-scattering corrections are taken into account. As discussed above, the scattering off spin fluctuations is strongest in the hot regions since the spin susceptibility is peaked at Q e1 and Q e2 , see Fig.…”

Section: Bmentioning

confidence: 99%

Transport in multiband systems with hot spots on the Fermi surface: Forward-scattering corrections

2014

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Multiband models with hot spots are of current interest partly because of their relevance for the iron-based superconductors. In these materials, the momentum-dependent scattering off spin fluctuations and the ellipticity of the electron Fermi pockets are responsible for anisotropy of the lifetimes of excitations around the Fermi surface. The deep minima of the lifetimes-the so-called hot spots-have been assumed to contribute little to the transport as is indeed predicted by a simple relaxation-time approach. Calculating forward-scattering corrections to this approximation, we find that the effective transport times are much more isotropic than the lifetimes and that, therefore, the hot spots contribute to the transport even in the case of strong spin-fluctuation scattering. We discuss this effect on the basis of an analytical solution of the Boltzmann equation and calculate numerically the temperature and doping dependence of the resistivity and the Hall, Seebeck, and Nernst coefficients.

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Signatures of quantum criticality in the thermopower of Ba(Fe1−xCox)2

Cited by 33 publications

References 80 publications

Universality and unconventional enhancement of flux-flow resistivity in Ba(Fe1−xCox)2As2

Universality and unconventional enhancement of flux-flow resistivity in Ba(Fe1−xCox)2As2

Thermoelectric power of Ba(Fe_1−xCo_x)₂As₂(0 ≤ x ≤ 0.05) and Ba(Fe_1−xRh_x)₂As₂(0 ≤ x ≤ 0.171)

Transport in multiband systems with hot spots on the Fermi surface: Forward-scattering corrections

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Signatures of quantum criticality in the thermopower of Ba(Fe1−xCox)2

Cited by 33 publications

References 80 publications

Universality and unconventional enhancement of flux-flow resistivity in Ba(Fe1−xCox)2As2

Universality and unconventional enhancement of flux-flow resistivity in Ba(Fe1−xCox)2As2

Thermoelectric power of Ba(Fe1−xCox)2As2(0 ≤ x ≤ 0.05) and Ba(Fe1−xRhx)2As2(0 ≤ x ≤ 0.171)

Transport in multiband systems with hot spots on the Fermi surface: Forward-scattering corrections

Contact Info

Product

Resources

About

Thermoelectric power of Ba(Fe_1−xCo_x)₂As₂(0 ≤ x ≤ 0.05) and Ba(Fe_1−xRh_x)₂As₂(0 ≤ x ≤ 0.171)