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

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

doi:10.1016/j.physc.2012.01.019

Cited by 3 publications

(2 citation statements)

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“…Watanabe et al [21] calculated the field dependence of the reversible magnetization of an s-wave system using the Eilenberger equations, which hold at arbitrary temperatures. We verified that the Ginzburg-Landau model with a Ginzburg-Landau parameter of 49 reproduces the Eilenberger curve of [21] close to the transition temperature (see also [22]). Reducing the temperature makes the Eilenberger curves slightly steeper at low fields and slightly flatter at high fields.…”

Section: Resultssupporting

confidence: 71%

Testing V₃Si for two-band superconductivity

Zehetmayer

Hecher

2014

Supercond. Sci. Technol.

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Is V3Si a two-band or a single-band superconductor? Everyone who searches the literature for this question will find conflicting answers, for V3Si was claimed to be a perfect example of two-band and claimed to be a perfect example of single-band superconductivity. In this article we intend to clarify the situation by presenting new experimental facts acquired from the magnetic properties of a V3Si single crystal. We probe for field dependent two-band effects by analyzing the reversible magnetization at different temperatures, and we probe for temperature dependent two-band effects by analyzing the superfluid density obtained by two different methods at different magnetic fields. All our results are reliably described within the single-band models and thus support the single-band scenario for V3Si but do not completely rule out the presence of a very small second gap.

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Section: Resultssupporting

confidence: 71%

Testing V₃Si for two-band superconductivity

Zehetmayer

Hecher

2014

Supercond. Sci. Technol.

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“…2 and 3 show the impurity scattering Γ dependences of ξ h /ξ c2 for d x 2 −y 2 pairing at different temperatures and different fields, respectively. In contrast to s-wave superconductors [27,28] the pair breaking effect in d-wave symmetry gives rise to growth of ξ h /ξ c2 . Fig.…”

Section: Epj Web Of Conferencesmentioning

confidence: 92%

Cutoff parameter and vortex core size ind-wave superconductors

Belova

Zakharchuk

Sharafeev

et al. 2014

EPJ Web of Conferences

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Abstract. There is some evidence that the electron-phonon mechanism is not strong enough to produce observed high critical temperatures in unconventional superconductors; this is the case in both the cuprates and Fe-based superconductors. The d-wave pairing in strongly correlated systems is consistent with the observation of nodal quasiparticles in the heavily hole doped superconductor KFe 2 As 2 with T c = 3 K and high-T c cuprates. In this work the Eilenberger equations are solved for anisotropic d x 2 −y 2 -wave superconductors. The cutoff parameter ξ h and vortex core size ξ 2 (the distance from the vortex center to the radius where the current density reaches its maximum value) in the mixed state are investigated numerically. The cutoff parameter determines the field distribution in the generalized London equation obtained as a projection of the quasiclassical theory. It can be used for the fitting of the μSR and small-angle neutron scattering (SANS) experimental data. Field and temperature dependences of ξ h /ξ c2 in d x 2 −y 2 -wave superconductors are similar to those in s-wave superconductors: ξ h /ξ c2 (B/B c2 ) dependence has minimum at high temperatures and shows monotonously increasing behavior at low temperatures. Here, ξ c2 is determined by the relation B c2 = Φ 0 /2πξ c2 2 . The ξ 2 /ξ c2 (B/B c2 ) dependence is monotonously decreasing function at intermediate and high temperatures.

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Vortex core size in unconventional superconductors

Zakharchuk

Belova

Сафончик

et al. 2013

Journal of Applied Physics

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Influence of the order parameter symmetries on the cutoff parameter ξh and vortex core size ξ2 (the distance from the vortex center at which the current density reaches the maximum value) in the mixed state are investigated in the framework of Eilenberger theory for unconventional superconductors. The cutoff parameter determines the field distribution in the generalized London equation obtained as a projection of the quasiclassical theory. It is used for the fitting of the μSR and small-angle neutron scattering experimental data. Anisotropic dx2−y2 and isotropic s±-wave superconducting pairings are studied. These pairing symmetries can be realized in iron pnictide superconductors. Conventional s++ pairing mediated electron-phonon interaction is also considered. Temperature, field, and impurity scattering dependences of ξh/ξc2 are obtained. It is found that normalized ξ2/ξc2(B/Bc2) dependence is increasing with pair breaking impurity scattering (interband scattering for s±-wave and intraband impurity scattering for d-wave superconductors). Here, ξc2 is the Ginzburg-Landau coherence length determined from the relation Bc2=Φ0/2πξc22, where Bc2 is an upper critical field and Φ0 is a flux quantum. Two types of ξ2/ξc2(B/Bc2) dependences are obtained for s± superconductors. It has minimum at low temperatures and small impurity scattering transforming in monotonously decreasing function at strong scattering and high temperatures. The second kind of this dependence was also found for d-wave superconductors at intermediate and high temperatures. In contrast, impurity scattering results in decreasing of ξ2/ξc2 field dependence in s++ superconductors.

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

Cited by 3 publications

References 58 publications

Testing V₃Si for two-band superconductivity

Testing V₃Si for two-band superconductivity

Cutoff parameter and vortex core size ind-wave superconductors

Vortex core size in unconventional superconductors

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

Cited by 3 publications

References 58 publications

Testing V3Si for two-band superconductivity

Testing V3Si for two-band superconductivity

Cutoff parameter and vortex core size ind-wave superconductors

Vortex core size in unconventional superconductors

Contact Info

Product

Resources

About

Testing V₃Si for two-band superconductivity

Testing V₃Si for two-band superconductivity