11B NMR and Relaxation in MgB2 Superconductor
Abstract
11B NMR and nuclear spin-lattice relaxation rate (NSLR) are reported at 7.2 Tesla and 1.4 Tesla in powder samples of the intermetallic compound MgB2 with superconducting transition temperature in zero field Tc = 39.2 K. From the first order quadrupole perturbed NMR specrum a quadrupole coupling frequency of 835 5 kHz is obtained. The Knight shift is very small and it decreases to zero in the superconducting phase. The NSLR follows a linear law with T1T = 165 10 (sec K) . The results in the normal phase indicate a negligible s-character of the wave function of the conduction electrons at the Fermi level. Below Tc the NSLR is strongly field dependent indicating the presence of an important contribution related to the density and the thermal motion of flux lines. No coherence peak is observed at the lower field investigated (1.4 T).
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