Tuning alloy disorder in diluted magnetic semiconductors in high fields to 89 T.

Alloy disorder in II-VI diluted magnetic semiconductors (DMS) is typically reduced when the local magnetic spins align in an applied magnetic field. An important and untested expectation of current models of alloy disorder, however, is that alloy fluctuations in many DMS compounds should increase again in very large magnetic fields of the order of 100 T. Here the authors measure the disorder potential in a Zn0.70Cd0.22Mn0.08Se quantum well via the low temperature photoluminescence linewidth using a pulsed magnet system to ∼89 T. Above 70 T, the linewidth is observed to increase again, in accord with a simple model of alloy disorder. [ABSTRACT FROM AUTHOR]