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

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

2006-12-13

arxiv.org/abs/cond-mat/0612332v1

Applied Physics Letters 90, 102109 (2007)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1063/1.2711370

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 order 100 tesla. Here we measure the disorder potential in a Zn$_{.70}$Cd$_{.22}$Mn$_{.08}$Se quantum well via the low temperature photoluminescence linewidth, using a new magnet system to 89 T. Above 70 T, the linewidth is observed to increase again, in accord with a simple model of alloy disorder.

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