Phys. Rev. Lett. 95, 207204 (2005) [4 pages]Ferromagnetism in Ga1-xMnxP: Evidence for Inter-Mn Exchange Mediated by Localized Holes within a Detached Impurity BandReceived 11 January 2005; revised 20 April 2005; published 8 November 2005 We report an energy gap for hole photoexcitation in ferromagnetic Ga1-xMnxP that is tunable by Mn concentration (x≤0.06) and by compensation with Te donors. For x∼0.06, electrical transport is dominated by excitation across this gap above the Curie temperature (TC) of 60 K and by thermally activated hopping below TC. Magnetization measurements reveal a moment of 3.9±0.4μB per substitutional Mn while the large anomalous Hall signal demonstrates that the ferromagnetism is carrier mediated. In aggregate these data indicate that ferromagnetic exchange is mediated by holes localized in a Mn-derived band that is detached from the valence band. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.207204
DOI:
10.1103/PhysRevLett.95.207204
PACS:
75.50.Pp, 72.60.+g, 73.50.Pz, 75.47.−m
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