Experimental evidence of a screening charge anisotropy around several normal impurities in aluminium

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Abstract
Nuclear quadrupolar couplings measured by the field cycling technique are reported for the first neighbouring shells of various impurities in aluminium (Mg, Si, Zn, Ga, Ge, Ag, Cd, In, Sn, Au, Cu). The quadrupolar solid effect lines due to dipolar couplings between nearby nuclei have been used for identification of the shells. The results indicate a strong anisotropy of the screening charge density with a minimum along the (100) directions. The distortions of the Fermi surface appearing near its intersections with the first Brillouin zone boundaries may explain the observed anisotropy.