Anisotropy in mixed superconducting state of two-band MgB2 superconductor

Kubota, D.; Ishida, Toshimasa

doi:10.1016/j.physc.2010.02.009

Physica C: Superconductivity and its Applications

2010

DOI: 10.1016/j.physc.2010.02.009

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Anisotropy in mixed superconducting state of two-band MgB2 superconductor

D. Kubota¹,

Toshimasa Ishida²

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2011

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Cited by 2 publications

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“…( 5) when γ = γ ξ = γ λ . The multi-band effect is expected to take place in oxypnictides [11] and MgB 2 [12]. As temperature decreases from T c down to T = 0, a discrepancy between γ ξ and γ λ becomes appreciable.…”

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Torque theory of anisotropic superconductors with no phenomenological parameter in determining vortex core size

2011

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The contribution of vortex core has been taken into account properly in constructing a torque theory for multiband superconductors. We employ the prescription of describing internal magnetic field in the vortex lattice by Hao et al. and by Yaouanc et al. to derive a torque formula as a natural extension of a preceding London theory. In marked contrast with the preceding model, our novel formula does not contain a phenomenological parameter η, which prevents us from obtaining a true upper critical field H c2 by analyzing an experimental torque curve. The parameter η was originally introduced to take care of the uncertainty in determining the vortex core size ξ v . Furthermore, we reveal that the η value is universally scaled by anisotropy γ, magnetic field B, and H c2 due to field dependence of ξ v . This may revitalize the single-band Kogan model in combination with a universal function η(γ, B, H c2 ) instead of a constant η.

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Torque theory of anisotropic superconductors with no phenomenological parameter in determining vortex core size

2011

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Magnetic torque analysis including vortex core contributions for Ba(Fe,Co)2As2 single crystal

Kubota

Nanba

Wolf

et al. 2011

Physica C: Superconductivity and its Applications

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Anisotropy in mixed superconducting state of two-band MgB2 superconductor

Cited by 2 publications

References 9 publications

Torque theory of anisotropic superconductors with no phenomenological parameter in determining vortex core size

Torque theory of anisotropic superconductors with no phenomenological parameter in determining vortex core size

Magnetic torque analysis including vortex core contributions for Ba(Fe,Co)2As2 single crystal

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