Ferromagnetism in Ga1xMnxP: Evidence for Inter-Mn Exchange Mediated by Localized Holes within a Detached Impurity Band

M. A. Scarpulla, B. L. Cardozo, R. Farshchi, W. M. Hlaing Oo, M. D. McCluskey, K. M. Yu, and O. D. Dubon
Phys. Rev. Lett. 95, 207204 – Published 8 November 2005

Abstract

We report an energy gap for hole photoexcitation in ferromagnetic Ga1xMnxP that is tunable by Mn concentration (x0.06) and by compensation with Te donors. For x0.06, 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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 11 January 2005

DOI:https://doi.org/10.1103/PhysRevLett.95.207204

©2005 American Physical Society

Authors & Affiliations

M. A. Scarpulla1,2, B. L. Cardozo1,2, R. Farshchi1,2, W. M. Hlaing Oo3, M. D. McCluskey3, K. M. Yu2, and O. D. Dubon1,2,*

  • 1Department of Materials Science & Engineering, University of California, Berkeley, California 94720, USA
  • 2Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 3Department of Physics, Washington State University, Pullman, Washington 99164-2814, USA

  • *Corresponding author. Electronic address: oddubon@berkeley.edu

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 95, Iss. 20 — 11 November 2005

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×