engleski

Magnetic-field-induced density of states in MgB_2: Spin susceptibility measured by conduction-electron spin resonance

The magnetic-field dependence of the electron spin susceptibility chi(s) was measured in the superconducting state of high-purity MgB_2 fine powders from the intensity of the conduction-electron spin resonance at 3.8, 9.4, and 35 GHz. The measurements confirm that a large part of the density of states is restored at low temperatures at fields below 1 T in qualitative agreement with the closing of the pi band gaps in the two-band model. However, the increase of chi(s) with field and temperature is larger than expected from current superconductor models of MgB_2.

Magnesium compounds; Type II superconductors; Electronic density of states; Magnetic susceptibility; Paramagnetic resonance; Superconducting energy gap

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