- There is (collinear) magnetic order.
- Conduction is metallic, like a common metal.
- The spin susceptibility vanishes, like an insulator.
Other contributions to the susceptibility remain.
- The total (spin) magnetic moment in the primitive cell is
- NMR relaxation rate 1/T1 is non-Korringa, because
low energy spin flips are disallowed.
- Spin-polarized spectroscopy at the Fermi level. In practice,
there are many complications.
- Spin-polarized positron annihilation. Also difficult, must
identify Fermi surface of one spin and establish that there is
no Fermi surface for the other spin.
- Tunneling: on-off characteristics, ideally. Interfaces can introduce
magnetic centers that flip spins, and other non-idealities can
occur at the interfaces.
- Thermodynamic and transport properties(?). This is still an
open question, because understanding of the half-metallic
state is incomplete.
Physical Properties of Half-Metallic Ferromagnets
See R. E. Rudd and W. E. Pickett,
Phys. Rev. B 57, 557 (1998)
The ordered double perovskite crystal structure, also called the
elpasolite or cryolite structure. Often the MO6
octrahedra are rotated around a <100>, <110> or <111> axis.