Previous abstract
Next abstract
Session Q14 - DCMP: SEMICONDUCTORS: MAGNETISM
Mixed session, Friday morning, March 24, 8:00
Room J4, San Jose Convention Center
We have studied the dependence of the exchange interaction, J, between the magnetic ions on the ionic separation in Diluted Magnetic Semiconductors (DMS). The spin freezing temperature, T_f , gives a measure of the average long range interaction between the magnetic ions. Previous workers H.J.Swagten, W.J.M. de Jonge, and M. Domianuik, Phys. Rev. B 36, 7013 (1987). suggested that T_f vs. x falls on a universal curve for all of the ternary wide gap DMS. In this work we measured T_f and J_eff \approx J_1 , the nearest neighbor exchange interaction, for a series of quaternaries, Cd_1-x-y Zn_y Mn_x Te . Our data show that for a fixed Mn concentration, x=0.1 , both T_f and J_eff vary linearly as a function of y . Extrapolating the best fit line to the ternary endpoints we obtain values of J_1 / k_B = - 6.42 \pm 0.35 K for CdMnTe and J_1 / k_B = - 9.79 \pm 0.30 K for ZnMnTe which is in good agreement with the published data.