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Magnetic susceptibility of diluted magnetic (semimagnetic) semiconductors: Further evidence for superexchange

1988; American Physical Society; Volume: 37; Issue: 4 Linguagem: Inglês

10.1103/physrevb.37.1860

1095-3795

Arkadiusz Lewicki, J. Spałek, J. K. Furdyna, R. R. Gałązka,

Chalcogenide Semiconductor Thin Films

We analyze the high-temperature magnetic-susceptibility data for ${\mathrm{Zn}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Mn}}_{\mathrm{x}}$Se, together with new results for the quaternary systems ${\mathrm{Hg}}_{1\mathrm{\ensuremath{-}}\mathrm{x}\mathrm{\ensuremath{-}}\mathrm{y}}$${\mathrm{Mn}}_{\mathrm{x}}$${\mathrm{Cd}}_{\mathrm{y}}$Te and ${\mathrm{Hg}}_{1\mathrm{\ensuremath{-}}\mathrm{x}\mathrm{\ensuremath{-}}\mathrm{y}}$${\mathrm{Mn}}_{\mathrm{x}}$${\mathrm{Zn}}_{\mathrm{y}}$Te. This analysis provides unambiguous new evidence that superexchange interaction via anions (Te,Se) is the dominant mechanism of d-d coupling in ${A}_{1\mathrm{\ensuremath{-}}x}^{\mathrm{II}}$${\mathrm{Mn}}_{\mathrm{x}}$${\mathrm{B}}^{\mathrm{VI}}$ alloys. We also discuss briefly the relationship between the high- and low-temperature magnetic properties of these systems.