Magnetic Field Induced Density of States in Superconducting MgB$_{2}$: Measurement of Conduction Electron Spin-Susceptibility

The magnetic field dependence of the spin-susceptibility, χ s was measured in the superconducting state of high purity MgB 2 fine powders below 1.3 T. χ s was determined from the intensity of the conduction electron spin resonance spectra at 3.8, 9.4, and 35 GHz. At the lowest magnetic fields (0.14 T), a gap opens in the density of states at the Fermi energy and, accordingly, χ s ( T ) is small at low temperatures. Fields above 0.2 T (about 15 % of H cc 2 , the minimum upper critical field), destroy the gap. The field induced χ s is much larger than expected from current superconductor models of MgB 2 .