Year: 2008
Type: article
Abstract: The giant Zeeman splitting of free excitons is measured in ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}\mathrm{N}$. Magneto-optical and magnetization data imply the ferromagnetic sign and a reduced magnitude of the effective $p\ensuremath{-}d$ exchange energy governing the interaction between ${\mathrm{Fe}}^{3+}$ ions and holes in GaN, ${N}_{0}{\ensuremath{\beta}}^{(\mathrm{app})}=+0.5\ifmmode\pm\else\textpm\fi{}0.2\text{ }\text{ }\mathrm{eV}$. This finding corroborates the recent suggestion that the strong $p\ensuremath{-}d$ hybridization specific to nitrides and oxides leads to significant renormalization of the valence band exchange splitting.
Source: Physical Review Letters
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2000786821