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Volumn 67, Issue 15, 2003, Pages

Disorder and ferromagnetism in diluted magnetic semiconductors

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EID: 61649089004     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.67.155202     Document Type: Article
Times cited : (3)

References (47)
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    • J. König, J. Schliemann, T. Jungwirth, and A. H. MacDoanld, in Electronic Structure and Magnetism of Complex Materials, edited by D. J. Singh and D. A. Papaconstantopoulos (Springer-Verlag, Berlin 2002);
    • J. König, J. Schliemann, T. Jungwirth, and A. H. MacDoanld, in Electronic Structure and Magnetism of Complex Materials, edited by D. J. Singh and D. A. Papaconstantopoulos (Springer-Verlag, Berlin 2002);
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    • ). The degree of compensation at (Formula presented) is less accurately known and likely to be sample dependent.
    • The carrier density in annealed samples at (Formula presented) has been extracted from high-field Hall effect data by T. Omiya, F. Matsukura, T. Dietl, Y. Ohno, T. Sakon, M. Motokawa, and H. Ohno, Physica E 7, 976 (2000). The degree of compensation at (Formula presented) is less accurately known and likely to be sample dependent.
    • (2000) Physica E , vol.7 , pp. 976
    • Omiya, T.1    Matsukura, F.2    Dietl, T.3    Ohno, Y.4    Sakon, T.5    Motokawa, M.6    Ohno, H.7
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    • cond-mat/0111300 (unpublished)
    • Density-functional electronic-structure techniques have been applied to these materials and will be important in refining models of the type we study. This approach has not yet advanced sufficiently to address the questions of interest here, partly because the local-density approximation overestimates exchange-coupling strengths. For a review see S. Sanvito, G. Theurich, and N.A. Hill, cond-mat/0111300 (unpublished).
    • Sanvito, S.1    Theurich, G.2    Hill, N.A.3
  • 31
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    • ), have suggested that noncollinear ground-state Mn ion orientations can occur in models with kinetic exchange only. Our calculations demonstrate that Coulomb interactions favor collinear configurations, although noncollinear configurations are still likely in the insulating regime. Quantum fluctuations in Mn ion orientations are weak because of the large separation between the energy scales for band electron and Mn ion spin fluctuations.
    • J. Schliemann and A.H. MacDonald, Phys. Rev. Lett. 88, 137201 (2002), have suggested that noncollinear ground-state Mn ion orientations can occur in models with kinetic exchange only. Our calculations demonstrate that Coulomb interactions favor collinear configurations, although noncollinear configurations are still likely in the insulating regime. Quantum fluctuations in Mn ion orientations are weak because of the large separation between the energy scales for band electron and Mn ion spin fluctuations.
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    • C. Timm, F. Schäfer, and F. von Oppen have pointed out that defect correlations, which we do not include here, will reduce the importance of disorder, expanding the validity range of the hole-fluid picture
    • C. Timm, F. Schäfer, and F. von Oppen have pointed out that defect correlations, which we do not include here, will reduce the importance of disorder, expanding the validity range of the hole-fluid picture.
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    • The model Hamiltonian parameters we use are those generally accepted for (Ga, Mn)As, the best understood (III, Mn) V ferromagnet. (Formula presented) (Formula presented) (Formula presented) (Formula presented) and (Formula presented) We diagonalize the HF Hamiltonian in a plane-wave representation, using periodic boundary conditions in the simulation cell. For different system sizes we maintain the cutoff wave-vector (Formula presented)
    • The model Hamiltonian parameters we use are those generally accepted for (Ga, Mn)As, the best understood (III, Mn) V ferromagnet. (Formula presented) (Formula presented) (Formula presented) (Formula presented) and (Formula presented) We diagonalize the HF Hamiltonian in a plane-wave representation, using periodic boundary conditions in the simulation cell. For different system sizes we maintain the cutoff wave-vector (Formula presented)
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    • T. Jungwirth, M. Abolfath, Jairo Sinova, J. Kucera, A.H. MacDonald, cond-mat/0206416 (unpublished)
    • T. Jungwirth, M. Abolfath, Jairo Sinova, J. Kucera, A.H. MacDonald, cond-mat/0206416 (unpublished).


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