Gallium-Doped Germanium Resistance Thermometers
It has been well established that the characteristics of single-crystal germanium doped with certain impurities are suitable for resistance thermometry at low temperatures. Indium was used as the dopant by Estermann  and by Friedberg , whereas Kunzler et al.  have described in detail a four-lead thermometer using arsenic as the major impurity. We have employed galliumdoped germanium with an impurity concentration of about 6 · 10-16 cm-3 and find that it has a characteristic which is useful over the range from 1° to 40°K.
KeywordsGallium Arsenide Gold Wire Impurity Conduction High Temperature Hydrogen Cryogenic Fluid
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