2003/02/28 by F. Simon, Ferenc Simon, A. Jánossy +15
Materials Science · Physics and Astronomy · #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #Thermal Expansion and Ionic Conductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.72.012511
published as Phys. Rev. B 72, 012511 (2005)
arxiv created 2003/02/28 · openalex publication_date 2005/07/22 · arxiv updated 2012/10/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The magnetic-field dependence of the electron spin susceptibility \ensuremathχs was measured in the superconducting state of high-purity MgB2 fine powders from the intensity of the conduction-electron spin resonance at 3.8, 9.4, and 35\phantom\rule0.3em0exGHz. The measurements confirm that a large part of the density of states is restored at low temperatures at fields below 1\phantom\rule0.3em0exT in qualitative agreement with the closing of the \ensuremathπ band gaps in the two-band model. However, the increase of \ensuremathχs with field and temperature is larger than expected from current superconductor models of MgB2.