negative value of the static dielectric constant
Posted: Tue Aug 11, 2009 2:36 am
I calculate an insulator containing 4f electrons. When I set LEPSILON = .TRUE., the OUTCAR gave the negative value for the static dielectric constant. The following is my result:
ε x y z
x 4.75 0 -0.174
y 0 4.902 0
z -0.174 0 5.363
I'm wondering why the dielectric constant would be negative?
And how to define the three directions x,y,z? Do they have relationship with the vectors a,b,c?
Thanks ahead.
<span class='smallblacktext'>[ Edited ]</span>
ε x y z
x 4.75 0 -0.174
y 0 4.902 0
z -0.174 0 5.363
I'm wondering why the dielectric constant would be negative?
And how to define the three directions x,y,z? Do they have relationship with the vectors a,b,c?
Thanks ahead.
<span class='smallblacktext'>[ Edited ]</span>