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Conducting and magnetic properties of a material often change in someconfined geometries. However, a situation where a non-magnetic semiconductorbecomes both metallic and magnetic at the surface is quite rare, and to thebest of our knowledge has never been observed in experiment. In this work, weemploy first-principles electronic structure theory to predict that such apeculiar magnetic state emerges in a family of quaternary Heusler compounds. Weinvestigate magnetic and electronic properties of CoCrTiP, FeMnTiP and CoMnVAl.For the latter material, we also analyse the magnetic exchange interactions anduse them for parametrizing an effective spin Hamiltonian. According to ourresults, magnetism in this material should persist at temperatures at least ashigh as 155 K.

Magnetic 2D electron liquid at the surface of Heusler semiconductors