2001/03/02 by C. Panagopoulos, B. D. Rainford, B.D. Rainford +7 · 7 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.64.094514
published as Physical Review B vol 64, 094514 (2001) · 4 pages 3 figures
arxiv created 2001/03/02 · openalex publication_date 2001/08/13 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We have measured the magnetic penetration depth of the recently discovered binary superconductor MgB2 using muon spin rotation and low-field ac susceptibility. From the damping of the muon precession signal we find the penetration depth at zero temperature is \ensuremath∼85 nm. The low-temperature penetration depth shows a quadratic temperature dependence, indicating either the presence of nodes in the gap or that the gap minimum must be smaller than the lowest temperature measured (4.2 K) if the pairing has anisotropic s-wave symmetry.