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(Color online) Nitrogen concentration (circle), hole concentration (triangle) (vertical axis on the left) and activation ratio of holes (square) (vertical axis on the right) are plotted as a function of Cr composition for a series of the samples which were grown under different Cr flux and the same nitrogen doping condition. was estimated from the lattice parameter assuming Vegard’s law and was deduced from Hall measurement at room temperature.
(Color online) The temperature dependence of the electric resistivity of with various . These samples are of the same series as in Fig. 1.
(Color online) curves of undoped (No. 0) and -doped (Nos. 1–3) . (Sample No. 3 is the same as the one plotted in Figs. 1 and 2.) The measurements were performed at 2 K with magnetic fields applied perpendicular to the film plane.
(Color online) (a)–(c) curves in undoped and -doped with (a) , (b) , and (c) . (-doped samples are the same as those plotted in Figs. 1 and 2.) (d) The magnetic-field dependence of the MCD signal intensity at around 2.3 eV of the same samples as in (c). All these measurements were performed at 2 K with magnetic fields applied perpendicular to the film plane.
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