Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-07-20
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.96.237204
We employ dynamical mean-field theory to identify the materials properties that optimize Tc for a generalized double-exchange (DE) model. We reach the surprising conclusion that Tc achieves a maximum when the band angular momentum j equals 3/2 and when the masses in the 1/2 and 3/2 sub-bands are equal. However, we also find that Tc is significantly reduced as the ratio of the masses decreases from one. Consequently, the search for dilute magnetic semiconductors (DMS) materials with high Tc should proceed on two fronts. In semiconductors with p bands, such as the currently studied Mn-doped Ge and GaAs semiconductors, Tc may be optimized by tuning the band masses through strain engineering or artificial nanostructures. On the other hand, semiconductors with s or d bands with nearly equal effective masses might prove to have higher Tc's than p-band materials with disparate effective masses.
Fishman Randy S.
Jarrell Mark
Moreno Juana
No associations
LandOfFree
Transition Temperature of a Magnetic Semiconductor with Angular Momentum j does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Transition Temperature of a Magnetic Semiconductor with Angular Momentum j, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transition Temperature of a Magnetic Semiconductor with Angular Momentum j will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-491161