[Pw_forum] Doubt in Curie temperature value

[Mighfar Imam]

I don't know how good an estimate of J_0 would be with this method,
nevertheless, Curie temp marks the transition from ferro to para, not from
ferro to antiferro!

Mighfar Imam,
JNCASR, Bangalore.



> Hi
>
> I am calculating the Curie Temperature for Iron. The experimental value
> for this is  1043 K. I am getting the value as 2398.97 K. I am using the
> following way to calculate.
> Find out the ferromagnetic and anti-ferromagnetic energy of Fe. The
> difference between these two gives the value of J_0. Then,
> T_c = [2/3] [J_0/K_B]
>
> Please suggest me what is wrong? Why am I getting such a high value. On
> the other hand I am getting very low value for Ni, whose experimental
> Curie temperature is 627K and I am getting 315K.
> Thanking you in advance,
> regards
> Padmaja Patnaik
>
> Research Scholar
>
> Dept of Physics
>
> IIT Bombay
>
> Mumbai, India
>
>
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