Electron paramagnetic resonance in Cd1-xMnxS, Cd1-xMnxSe, and Cd1-xMnxTe

Nitin Samarth, J. K. Furdyna

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70 Scopus citations

Abstract

We present results of a systematic investigation of EPR in the Cd-based family of diluted magnetic semiconductors (Cd1-xMnxS, Cd1-xMnxSe, and Cd1-xMnxTe) over a wide range of temperature and Mn concentration. The dependence of the EPR linewidth on the anion of the host lattice is established. Specifically, we find that, at a fixed temperature and Mn concentration, the linewidth increases in the order of sulfide, selenide, and telluride. This trend holds over a wide range of sample composition and temperature. We also demonstrate that the general EPR behavior in all three alloys is identical: namely, the absorption line shape is Lorentzian in the paramagnetic region of the phase diagram, and broadens with increasing x and decreasing T. The Lorentzian-regime line shape is analyzed using the exchange-narrowing picture. The observed dependence of the EPR linewidth on the anion cannot be explained by dipolar broadening alone. We argue that the dominant anisotropic spin-spin interaction must be the anisotropic part of the exchange interaction, and speculate that the Dzyaloshinski-Moriya interaction may play a role. The exchange-narrowing theory is also used to examine the variation of the linewidth with sample composition and temperature. At very low temperatures, as the spin-glass transition is approached, the line shape deviates from Lorentzian behavior and the resonance appears to shift to lower fields. These non-Lorentzian line shapes are discussed with reference to similar behavior in other spin-glasses.

Original languageEnglish (US)
Pages (from-to)9227-9239
Number of pages13
JournalPhysical Review B
Volume37
Issue number16
DOIs
StatePublished - Jan 1 1988

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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