BAND-EDGE PROPERTIES OF A SEMICONDUCTOR ALLOY - AN NMR-STUDY OF HG1-XCDXTE | |
Article | |
关键词: NUCLEAR-MAGNETIC-RESONANCE; KNIGHT-SHIFT; STATES; GAP; TEMPERATURE; ALXGA1-XAS; RELAXATION; DENSITY; TE-125; PBTE; | |
DOI : 10.1103/PhysRevB.48.8742 | |
来源: SCIE |
【 摘 要 】
We report Hg-199 NMR measurements of narrow-gap Hg1-xCdxTe alloys in the range x=0.20-0.28. By studying temperature dependences, we have identified intrinsic Knight shifts in these alloys. This provides a measure of Hg orbital contributions to conduction-electron states, and we find a consistently strong average contribution from Hg s orbitals. Furthermore, we identify local variations in the Knight shift with spatial variations in conduction-electron densities and symmetries. These characteristics have been related to randomly populated sites within the alloys. We also discuss Hg-199 chemical shifts and their relation to local orbital charges.
【 授权许可】
Free