Onset of ferromagnetism in low-doped Ga1-xMnxAs

B. L. Sheu, R. C. Myers, J. M. Tang, N. Samarth, D. D. Awschalom, P. Schiffer, M. E. Flatté

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Abstract

We develop a quantitatively predictive theory for impurity-band ferromagnetism in the low-doping regime of Ga1-xMnxAs. We compare it with measurements of a series of samples whose compositions span the transition from paramagnetic insulating to ferromagnetic conducting behavior. The theoretical Curie temperatures depend sensitively on the local fluctuations in the Mn-hole binding energy, which originate from Mn disorder and As antisite defects. The experimentally determined hopping energy is an excellent predictor of the Curie temperature, in agreement with the theory.

Original languageEnglish (US)
Article number227205
JournalPhysical review letters
Volume99
Issue number22
DOIs
StatePublished - Nov 28 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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