2001/03/04 by Shiliang Li, S. L. Li, Hai‐Hu Wen +11 · 1 citation
Materials Science · Physics and Astronomy · #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #Thermal Expansion and Ionic Conductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.64.094522
published as Phys. Rev. B 64, 094522 (2001) · 4 pages, 4 figures
arxiv created 2001/03/04 · openalex publication_date 2001/08/15 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The lower critical field Hc1 has been carefully measured on a well-shaped cylindrical dense sample of the new superconductor MgB2 fabricated by high-pressure synthesis. The penetration depth \ensuremathλ is calculated from the Hc1 data. It is found that a linear relation of Hc1(T) appears in the whole temperature region below Tc. Furthermore, a finite slope of dHc1/dT and d\ensuremathλ(T)/dT remains down to the lowest temperature (2 K). These are inconsistent with the expectation for an isotropic s-wave superconductivity in MgB2.