[Wien] True half métal and false half métal

[SEMEH NOUI]

Hello sir, I have a questions to ask you
1-I have a Heusler alloy when I calculated the band structure I find that
the energetic gap exceeds or touches the conduction band of the fermi
levels in (spin dn) direction
My question, is this compound is a half metal or metal
2-how I can distinguish a real half metal and false half metal
3-I have another compound when I applied the GGA approximation I did not
find a gap at the level of fermi but I applied the MBJ (GGA) the gap appears
My question is what I consider that this compound is metal or half metal
I will wait for your reply


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[Wien] optical properties of half métal

[SEMEH NOUI]

Hello sir
First thanks for your help with my questions.
Monsieus I worked on the Co2MnSi compound (Heusler Holloy) when I made the
optical properties for wien 2K 2013 and 2014 (software does not separate me
in the real or imaginary part of the dielectric function (the spin up and
Spin dn).It gives me a single epsilon,I did not  .understand why please I
want to explain the steps to find where is the problem
I will wait for your reply



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