Anisotropy and internal-field distribution ofMgB2in the mixed state at low temperatures

2004/05/20 by M. Angst, Manuel Angst, D. Di Castro +17 · 2 citations
Materials Science · Physics and Astronomy · #Hydrogen Storage and Materials #Rare-earth and actinide compounds #Superconductivity in MgB2 and Alloys #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.70.224513

published as Phys. Rev. B 70, 224513 (2004) · 4 pages, 4 figures

arxiv created 2004/05/20 · openalex publication_date 2004/12/14 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04

Abstract

Magnetization and muon spin relaxation on MgB₂ were measured as a function of the applied magnetic field at 2\phantom\rule0.3em0exK. Both indicate an inverse-squared penetration depth strongly decreasing with increasing field H below about 1\phantom\rule0.3em0exT. Magnetization also suggests the anisotropy of the penetration depth increases with increasing H, interpolating between a low H_c1 and a high H_c2 anisotropy. Measurements of the torque as a function of the angle between the field and the c axis of the crystal 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.

Citations

• Macroscopic anisotropy in superconductors with anisotropic gaps
• Vortex Imaging in theπBand of Magnesium Diboride
• Muon spin relaxation study of the magnetic penetration depth inMgB2
• Anisotropic properties of MgB2 by torque magnetometry
• Evidence for Two Superconducting Energy Gaps inMgB2by Point-Contact Spectroscopy

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