We observe a sharp feature in the ultra-low-temperature magnetoconductivity of degenerately doped Ge:Sb at H25 kOe, which is robust up to at least three times the critical density for the insulator-metal transition. This field corresponds to a low-energy scale characteristic of the special nature of antimony donors in germanium. Its presence and sensitivity to uniaxial stress confirm the notion of metallic impurity bands in doped germanium.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics