Raman scattering studies on ZnO doped with Ga and N (codoping), and magnetic impurities

Hasuike, Noriyuki; Fukumura, Hiroshi; Harima, Hiroshi; Kisoda, Kenji; Matsui, Hiroaki; Saeki, Hiromasa; Tabata, Hitoshi

doi:10.1088/0953-8984/16/48/053

Cited by 52 publications

(36 citation statements)

References 15 publications

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“…Also, the dominant mode in the disordered region appears to be closer to 550 cm -1 vice 522 or 580 cm -1 . These findings are quite similar to reports of Raman spectra in Zn 1-x Co x O which does exhibit the ferromagnetic behavior [21] crystals were grown by a modified meltgrowth technique described elsewhere [13]. Varying doping levels of Mn and Co were incorporated into the ZnO crystals during the growth process by varying the ratio of transition metal oxide to zinc oxide within the precursor boule.…”

Section: Resultssupporting

confidence: 87%

Magnetic and optical properties of single crystals of transition metal doped ZnO

Kane

Fenwick

Straßburg

et al. 2007

Physica Status Solidi (b)

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Considerable effort has been devoted to the study of transition metal doped zinc oxide following various theoretical predictions of room temperature ferromagnetism in these materials. Near equilibrium growth techniques may be suitable for the production of dilute transition metal doped ZnO because the transition metal solubility in ZnO can be relatively high. This work reports on the optical, structural, and magnetic properties of single crystals of Co-and Mn-doped ZnO grown by a modified melt-growth technique. X-ray diffraction reveals that the as grown crystals are pure single crystals with no second phases. Mn doping up to 5% results in an increase in c-axis lattice parameter (5.207 Å to 5.211 Å), and X-ray linewidths (78 arcsec to 252 arcsec) at doping levels of 5% Mn. Optical transmission shows distinct absorption spectra related to the color of the Zn 1-x TM x O sample resulting from interatomic transitions within the divalent transition metal ion. Electron paramagnetic resonance confirms the divalent nature of the substitutional transition metal ions. Raman spectroscopy shows the predominantly the E 2 (high) peak at 407 cm -1 , but with increasing doping shows additional disorder-related modes. The magnetic behavior reveals a paramagnetic behavior at all temperatures for both Mn-and Co-doped ZnO up to transition metal doping levels of 5% and 3% respectively. The dominant exchange mechanism in the Mn-and Co-doped ZnO crystals is found to be antiferromagnetic superexchange.

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Section: Resultssupporting

confidence: 87%

Magnetic and optical properties of single crystals of transition metal doped ZnO

Kane

Fenwick

Straßburg

et al. 2007

Physica Status Solidi (b)

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“…9 Also, the correlation between N concentration and the intensity of the additional peaks has been confirmed by some works 8,10 and contradicted by others. 9 In a recent study, 10 on the basis of a local phonon density of states calculation, it was suggested that the additional mode observed at 275 cm −1 originates from localized vibration of the Zn atoms in a first-neighbor environment where part of the O atoms are replaced by N atoms. No experimental evidence of the participation of N atoms in the LVM observed in N-doped ZnO has been given so far.…”

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confidence: 89%

Isotopic study of the nitrogen-related modes in N+-implanted ZnO

Artús

Cuscó

Alarcón-Lladó

et al. 2007

Applied Physics Letters

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Micro-Raman measurements were performed to study the nitrogen-related modes in ZnO samples implanted with N+. The two stable N isotopes, N14 and N15, were implanted. Distinct peaks at 277 and 512cm−1 are observed irrespective of the implanted isotope, both before and after rapid thermal annealing. The insensitivity of the mode frequencies to the implanted isotope rules out the explanation of these modes as local vibrational modes involving N motion. These modes were not detected in ZnO samples implanted with Zn+, O+, or P+, which suggests that they may be associated with distortions∕defects favored by the presence of N.

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“…Rigid Ion Model Parameters for ZnO (All parameters are in units of N·cm −1 , except for Z which is an effective charge, a number.) [4] 522.0 [10] 514.9 Present and eigenvectors, and the defect mode is identified from the eigenvector, as usual. The Kellerman parameters determined by the rigid ion model are given in Table II.…”

Section: Molecular Modelmentioning

confidence: 99%

“…In addition to Dietl's prediction, ferromagnetism (FM) in magnetically doped ZnO has been theoretically investigated by ab initio calculations based on the local density approximation [2]. Although reviews are available for bulk and nano-ZnO doped with magnetic impurities like Co and V [4], very few reports are available for ZnO doped with manganese [5]. Sharma et al [2] have carried out measurements on ZnO:Mn for the FM transition.…”

Section: Introductionmentioning

confidence: 99%

On the Optical, Thermal, and Vibrational Properties of Nano-ZnO:Mn, A Diluted Magnetic Semiconductor

Lakshmi

Ramachandran

2007

Int J Thermophys

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Nano-zinc oxide and Mn-doped zinc oxide were synthesized by a chemical process, and the average size of the particles observed was 35 nm for nanoZnO. Optical and thermal characterizations were carried out by means of photoluminescence and photoacoustic spectroscopy. It was found that nanoZnO has a thermal diffusivity one order of magnitude larger than bulk ZnO. Similarly, a less explored localized defect mode in ZnO:Mn was studied theoretically and experimentally using FTIR spectroscopy. The localized mode was experimentally found to be 514 cm −1 , compared to its theoretical value of 502 cm −1 . These values suggest that the current theory of bulk materials can also be extended to nanosystems and they are consistent with our hypothesis that Mn goes substitutionally as an impurity displacing Zn in nano-ZnO.

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Raman scattering studies on ZnO doped with Ga and N (codoping), and magnetic impurities

Cited by 52 publications

References 15 publications

Magnetic and optical properties of single crystals of transition metal doped ZnO

Magnetic and optical properties of single crystals of transition metal doped ZnO

Isotopic study of the nitrogen-related modes in N+-implanted ZnO

On the Optical, Thermal, and Vibrational Properties of Nano-ZnO:Mn, A Diluted Magnetic Semiconductor

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