Tuesday, April 12, 2005, 1:30 pm — Large Seminar Room, Bldg. 510
Ferromagnetic semiconductors are envisioned as key components of many proposed spintronic electronic devices that functionalize both the electron charge and spin. There have been many theories of the origin of ferromagnetism in doped semiconductors, but it has been difficult to obtain a clean comparison between theory and experiment because of problems associated with clustering or phase separation of magnetic dopants in the semiconducting host. In this talk I will present evidence that the stoichiometric compound Yb14MnSb11 can be viewed as a "natural" bulk dilute magnetic semiconductor, and that the ferromagnetism is mediated by heavy quasiparticles similar in character to Zhang-Rice singlets. Because the local environment of each Mn atom is similar to that found in the heavily studied III-V semiconductors such as GaAs:Mn, the present results may also have significant implications for III-V materials as well.
Hosted by: Cedomir Petrovic
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