The magnetic-field dependence of the electron spin susceptibility χs 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 35GHz. The measurements confirm that a large part of the density of states is restored at low temperatures at fields below 1T in qualitative agreement with the closing of the π band gaps in the two-band model. However, the increase of χs with field and temperature is larger than expected from current superconductor models of MgB2.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Oct 27 2005|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics