Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 9: Poster 1

HL 9.59: Poster

Montag, 23. März 2009, 14:30–17:00, P2

Influence of Mn on the impurity-band transport in Cl-doped (Zn,Mn)Se — •Jörg Teubert¹, Peter J. Klar¹, and Michael Hetterich² — ¹I.Physikalisches Institut JLU-Giessen — ²Institut für Angewandte Physik, Universität Karlsruhe

The hopping mechanism of conduction in ordinary, non-magnetic semiconductors has been studied extensively, but little is known about the influence of magnetic interactions in this regime. In II_1-x-Mn_x-VI compounds, Mn²⁺-ions are incorporated isovalently on group II lattice sites. The half filled d-shells of Mn ions give rise to local magnetic moments (total spin S=5/2). At a concentration of x ≈ 6%, the hydrogen-like wavefunction of a shallow donor overlaps with several hundred localized spins giving rise to s-d exchange interaction. We present magnetotransport properties of n-doped Zn_0.94Mn_0.06Se:Cl crystals with Cl doping concentrations both below and above the metal-insulator transition. The modifications of the impurity band transport induced by magnetic interactions will be studied and the interpretations given by present theories will be discussed.