The band structure of Mn-based Heusler alloys of the $C{1}_b$ crystal structure (MgAgAs type) has been calculated with the augmented-spherical-wave method. Some of these magnetic compounds show unusual electronic properties. The majority-spin electrons are metallic, whereas the minority-spin electrons are semiconducting.

• Received 21 March 1983

DOI:https://doi.org/10.1103/PhysRevLett.50.2024