Activated dynamic scaling and magnetic ordering in Cd sub (1-x) Mn sub x Te: Spin glass or random antiferromagnet?
16 November 1987
The dynamics of magnetic fluctuations have been investigated in the random frustrated antiferromagnet Cd sub (1-x) Mn sub x Te. The frequency dependent susceptibility, X'(omega, T) has been measured by Faraday rotation for x=.4 and x=.65.
The departure of the susceptibility from equilibrium, DELTAX' = [X' sub (eq)(T)-X'(omega, T)]/X sub (eq) (T) is found to obey activated dynamic scaling similar to that seen in random field systems.
These results in conjunction with neutron measurements by others which revealed the abrupt saturation of the antiferromagnetic correlation length for x=.65 at the onset of slow dynamics near T sub c suggest a dynamically inhibited transition to a type III AF state rather than a spin glass transition.