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Lattice, band, and spin engineering in Zn1− x Co x O
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10.1063/1.4804656
/content/aip/journal/jap/113/18/10.1063/1.4804656
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/18/10.1063/1.4804656
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Figures

Image of FIG. 1.
FIG. 1.

(a) Typical (0002) 2θ/ scan curves of Zn CoO ( = 0, 0.01, 0.05, 0.10, 0.16, 0.19, and 0.24) layers. (b) Dependence of - and -axis lattice lengths on Co content (). Closed and empty circles indicate - and -axis lattice lengths, respectively. (c) Dependence of cell volume on Co content ().

Image of FIG. 2.
FIG. 2.

(a) Dependence of the ratio (/) of - and -axis lattice lengths on Co concentration (). (b) Dependence of the parameter on Co concentration (). Inset figure shows typical tetrahedral coordination in a wurtzite-type structure (6 ) consisting of (cation) and (anion) atoms. The value of indicates the deformed ration from a regular tetrahedron and is calculated using the following equation:  = 1/3(/) + 1/4. (c) Δ versus in Zn CoO obtained with a combination of (a) and (b).

Image of FIG. 3.
FIG. 3.

(a) MCD spectra at 10 K measured at Co-related 3 intra-transitions in Zn CoO layers with  = 0.01 (orange), 0.05 (pink), 0.10 (black), 0.16 (green), 0.19 (red), and 0.24 (blue). (b) MCD intensity and (c) peak energy at the 3 intra-transition from () to () as a function of Co concentration (). Inset shows PL spectra at 10 K of Zn CoO with  = 0.01 and 0.05.

Image of FIG. 4.
FIG. 4.

MCD spectra at 10 K measured in photon energies from ultra-violet to visible regions in Zn CoO layers with  = 0.01 (a)–0.24 (f). The dotted lines represent non-polarized absorption spectra at 10 K in Zn CoO layers with  = 0.01–0.24. (g) A line-width ( ) of MCD peak at 10 K as a function of Co concentration.

Image of FIG. 5.
FIG. 5.

(a) Peak energies derived from the MCD and absorption spectra at the band edge, which essentially indicates the band gap of Zn CoO layers. (b) Valence band XPS spectra of Zn CoO with  = 0, 0.16, and 0.24. (c) The difference spectra (closed and empty circles) between ZnO and Zn CoO ( = 0.16 and 0.24) layers are related to the Co 3 states.

Image of FIG. 6.
FIG. 6.

(a) Zeeman splitting energy (Δ) due to the exchange interaction as a function of Co concentration (). Red and green lines indicate probabilities of Co singles and open triples calculated by Beheringer's equations. (b) Probabilities of Co pairs and closed triples calculated by Beheringer's equations.

Image of FIG. 7.
FIG. 7.

(a) Temperature dependence of the Zeeman splitting energy of Zn CoO layers with  = 0.01, 0.10, and 0.24. The inset shows the magnetic field dependence of the MCD signal intensity at  = 0.10. (b) The parameter values of and (10 K) as a function of Co concentration ().

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/content/aip/journal/jap/113/18/10.1063/1.4804656
2013-05-14
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Lattice, band, and spin engineering in Zn1−xCoxO
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/18/10.1063/1.4804656
10.1063/1.4804656
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