Anisotropy parameters of superconducting MgB${}_2$

Abstract

Data on macroscopic superconducting anisotropy of MgB${}_2$ are reviewed. The data are described within a weak coupling two-gaps anisotropic s-wave model of superconductivity. The calculated ratio of the upper critical fields ${\gamma }_H=H_{c2,ab}/H_{c2,c}$ increases with decreasing temperature in agreement with available data, whereas the calculated ratio of London penetration depths ${\gamma }_{\lambda }={\lambda }_c/{\lambda }_{ab}$ decreases to reach $\approx 1.1$ at T=0. Possible macroscopic consequences of ${\gamma }_{\lambda }\ne {\gamma }_H$ are discussed.

accepted to Physica C, special MgB2 issue

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• Theoretical estimates of maximum fields in superconducting resonant radio frequency cavities: Stability theory, disorder, and laminates
• Superconductivity of magnesium diboride
• Point-contact spectroscopy of Al- and C-doped MgB2. Superconducting energy gaps and scattering studies
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• Advances in point-contact spectroscopy: two-band superconductor MgB2 (A review)
• Anisotropy and internal field distribution of MgB2 in the mixed state at low temperatures
• Upper critical field anisotropy in BaFe2-xCoxAs2 single crystals synthesized without flux
• Hc2 of anisotropy two-band superconductors by Ginzburg-Landau approach
• Lessons from Oxypnictide Thin Films
• Ginzburg-Landau theory of the superheating field anisotropy of layered superconductors
• Layered superconductor in a magnetic field: breakdown of the effective masses model
• Surface superconducting states in a polycrystalline MgB${}_2$ sample
• Anisotropy and Penetration Depth of MgB${}_2$ from ${}^{11}$B NMR
• High-pressure high-temperature solution growth, structural, and superconducting properties of Fe-substituted MgB2 single crystals
• Magnetic field induced orientation of superconducting MgB${}_2$ crystallites determined by X-ray diffraction