$^{11}B$ NMR and Relaxation in $MgB_2$ Superconductor

Details $^{11}B$ NMR and Relaxation in $MgB_2$ Superconductor $^{11}B$ NMR and Relaxation in $MgB_2$ Superconductor

2001-03-01

arxiv.org/abs/cond-mat/0103040v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.64.012514

$^{11}B$ 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 $MgB_2$ with superconducting transition temperature in zero field $T_c$ = 39.2 K. From the first order quadrupole perturbed NMR specrum a quadrupole coupling frequency of 835 $\pm$ 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 $T_1T$ = 165 $\pm$ 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 $T_c$ 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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