Cutoff parameter of the field distribution in the mixed state of iron pnictides with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mo>+</mml:mo><mml:mo>+</mml:mo></mml:mrow></mml:msub></mml:mrow></mml:math>pairing symmetries

Belova, P.; Сафончик, М.; Traito, K. B.; Lähderanta, E.

doi:10.1103/physrevb.83.104518

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…With this formalism the form factor can be computed with the effect of a finite mfp accounted for. 30 It would be worthwhile to reproduce the analytical results described here with the numerical method and extend this study outside the region of validity of the analytical solution, i.e., far below B c2 (T ).…”

Section: Discussionmentioning

confidence: 86%

Magnetic form factor, field map, and field distribution for a BCS type-II superconductor near itsBc2(T)phase boundary

Maisuradze

Yaouanc

2013

Phys. Rev. B

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We review the magnetic form factor deduced by Delrieu from Gorkov's equation for a Bardeen-Cooper-Schrieffer (BCS) type-II superconductor near its B c2 phase boundary, i.e., when its magnetization is small. A numerical study of the form factor, field map, and field distribution follows. The characteristics of the transition from the low-temperature BCS to the high-temperature Ginzburg-Landau vortex lattices is studied. The exotic shape of the component field distribution and the form factor at low temperature and as a function of the external field intensity are discussed. Our numerical work should be helpful for the analyzing of small-angle neutron scattering and muon spin rotation vortex-lattice data recorded for BCS superconductors and may be other superconductors in the clean limit.

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Section: Discussionmentioning

confidence: 86%

Magnetic form factor, field map, and field distribution for a BCS type-II superconductor near itsBc2(T)phase boundary

Maisuradze

Yaouanc

2013

Phys. Rev. B

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“…In s ++ symmetry ξ h /ξ c2 always decreases with impurity scattering rate Γ ( Fig. 1 (a)), in s ± symmetry its behavior depends on the field range and relative values of intraband and interband impurity scattering rates: it can be a decreasing function of Γ π [8] or an increasing function of Γ π (Fig. 1 (b)).…”

Section: Resultsmentioning

confidence: 98%

“…[9,10] this model of scattering reasonably explains experimental results. The Eilenberger equations for quasiclassical functions f and g under Riccati parametrization can be written as [8] …”

Section: 75mentioning

confidence: 99%

Vortex core properties in iron pnictides

Zakharchuk

Sharafeev

Belova

et al. 2014

EPJ Web of Conferences

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Abstract. The mechanism of unconventional superconductivity in recently discovered Fe-based superconductors has been intensively discussed. A plausible candidate is the superconducting (SC) pairing mediated by antiferromagnetic (AFM) interactions. There are two different approaches predicting the s ± pairing state, in which the SC gap shows an s-wave symmetry that changes sign between different Fermi-surface (FS) sheets. The first one is based on the itinerant spin fluctuations promoted by FS nesting, and the second is based on the local AFM exchange couplings. We apply quasiclassical Eilenberger approach to the vortex state to calculate the cutoff parameter, ξ h , at different levels of impurity scattering rates and to compare results with experimental data for iron pnictides. The s ± -wave pairing symmetry is considered as a presumable state for these materials. Magnetic field dependence of ξ h /ξ c2 is found to be nonuniversal for s ± pairing: depending on the chosen parameter set it can reside both below and above analytical Ginzburg-Landau curve. It is also found that normalized ξ 2 /ξ c2 (B/B c2 ) dependence is increasing with pair-breaking (interband) impurity scattering, and the intraband scattering results in decreasing of the ξ 2 /ξ c2 value. Here, ξ 2 is the vortex core size and ξ c2 is the GinzburgLandau coherence length determined from the upper critical field. The ξ 2 /ξ c2 (B/B c2 ) curve has a minimum at low temperatures and small scattering evolving into monotonously decreasing function at strong scattering and high temperatures.

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Generalized London theory of the mixed state of high-κ superconductors as a projection of the quasiclassical Eilenberger approach

Belova

Zakharchuk

Сафончик

et al. 2012

Physica C: Superconductivity

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Cutoff parameter of the field distribution in the mixed state of iron pnictides withs±ands++pairing symmetries

Cited by 5 publications

References 36 publications

Magnetic form factor, field map, and field distribution for a BCS type-II superconductor near itsBc2(T)phase boundary

Magnetic form factor, field map, and field distribution for a BCS type-II superconductor near itsBc2(T)phase boundary

Vortex core properties in iron pnictides

Generalized London theory of the mixed state of high-κ superconductors as a projection of the quasiclassical Eilenberger approach

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