Anisotropy and internal field distribution of MgB2 in the mixed state at low temperatures

Abstract

Magnetization and muon spin relaxation on MgB2 were measured as a function of field at 2 K. Both indicate an inverse-squared penetration depth strongly decreasing with increasing field H below about 1 T. Magnetization also suggests the anisotropy of the penetration depth to increase with increasing H, interpolating between a low Hc1 and a high Hc2 anisotropy. Torque vs angle measurements are in agreement with this finding, while also ruling out drastic differences between the mixed state anisotropies of the two basic length scales penetration depth and coherence length.

arXiv comment4 pages, 4 figures

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• SrPt${}_3$P: two-band single-gap superconductor
• Effect of field dependent core size on reversible magnetization of high-$\kappa$ superconductors
• Measuring the Penetration Depth Anisotropy in MgB${}_2$ using Small-Angle Neutron Scattering
• Evidence for a temperature dependent anisotropy of the superconducting state parameters in underdoped SmBa2Cu3Ox
• Field Dependent Superfluid Density in the Optimally Doped SmFeAsO_(1-x)F_y Superconductor
• Multi-band superconductivity in LaFeAsO_{0.9}F_{0.1} single crystals probed by high-field vortex torque magnetometry
• Anisotropy and Penetration Depth of MgB${}_2$ from ${}^{11}$B NMR
• Comment on ``Muon-spin rotation studies of the superconducting properties of Mo_3Sb_7'', Phys.Rev.B 78, 172505 (2008)
• Consequences of the peculiar intrinsic properties of MgB2 on its macroscopic current flow
• Magnetic field induced orientation of superconducting MgB${}_2$ crystallites determined by X-ray diffraction