Jh. Shi et al., BAND-EDGE PROPERTIES OF A SEMICONDUCTOR ALLOY - AN NMR-STUDY OF HG1-XCDXTE, Physical review. B, Condensed matter, 48(12), 1993, pp. 8742-8746
We report Hg-199 NMR measurements of narrow-gap Hg1-xCdxTe alloys in t
he range x=0.20-0.28. By studying temperature dependences, we have ide
ntified intrinsic Knight shifts in these alloys. This provides a measu
re of Hg orbital contributions to conduction-electron states, and we f
ind a consistently strong average contribution from Hg s orbitals. Fur
thermore, we identify local variations in the Knight shift with spatia
l variations in conduction-electron densities and symmetries. These ch
aracteristics have been related to randomly populated sites within the
alloys. We also discuss Hg-199 chemical shifts and their relation to
local orbital charges.