Low temperature resistance of p-InSb(Mn)

Thermoresistors made of InSb(Mn) for use at ultra-low temperatures are described. Below 10 mK they have higher thermosensitivity than other known thermoresistors, with a relatively low specific resistance. They have a logarithmic dependence of specific resistance on temperature and negative magnetoresistance. The magnetic Mn 2+ impurity in the non-magnetic semiconductor InSb is supposed to cause a magnetic gap in the impurity band owing to exchange interaction between manganese ions and holes. This effect increases for compensated p-InSb(Mn).