Raman Spectroscopy of Co-Doped ZnO Bulk Crystals

Szuszkiewicz, W.; Morhange, J. F.; Golacki, Z.; Łusakowski, A.; Schumm, Marcel; Geurts, J.

doi:10.12693/aphyspola.112.363

Cited by 15 publications

(13 citation statements)

References 18 publications

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“…As it has been demonstrated previously by Raman scattering measurements performed in a much wider spectral range [17], the investigated sample contains both Co and CoO precipitates. None of these secondary phases exhibit any vibration, electronic, or magnetic excitations that may be the origin of the observed Raman signal at the frequency given above.…”

Section: Resultsmentioning

confidence: 63%

“…The bulk sample containing approximately 1.6 at.% of Co [17] has been selected for a further analysis with the use of the Raman spectroscopy. The total Co content in the investigated sample was determined by two independent methods: by the electron microprobe and by measurements of magnetic properties (from the saturation of magnetization).…”

Section: Methodsmentioning

confidence: 99%

“…Most of the measurements were performed at room temperature only ( [17] and references therein, see also [14,18,19]), the low-frequency spectral range has not attracted a lot of attention up to now [17]. A large number of experimental data for the Zn 1−x Co x O mixed crystals confirm the substitution position of Co 2+ ion in (103) the host ZnO lattice as well as the presence of various types of precipitates in such system.…”

Section: Introductionmentioning

confidence: 99%

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Low-Frequency Raman Spectrum οf Bulk Zn_0.984Co_0.016O Crystal

et al. 2009

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The influence of possible presence of Co 2+ ion pairs in a bulk Zn1−xCoxO mixed crystal on the low-frequency part of the Raman spectrum is discussed. Two effects can be taken into account in the theoretical considerations when analyzing the energy level scheme corresponding to Co ions. The first is a local lattice deformation in the vicinity of Co 2+ ion due to a presence of the second ion, smaller than the host ZnO lattice cation. Such deformation creates a trigonal field, which can only slightly modify the energy levels of Co 2+ ion. The second effect, which results from an antiferromagnetic superexchange interaction between two Co 2+ ions is responsible for a new set of energy levels. The Raman data taken at low temperature on the sample corresponding to the composition x = 0.016 demonstrated the presence of two structures at about 6 cm −1 and 13 cm −1 . These structures may be interpreted as electronic transitions between the ground state and the first excited state of a single Co 2+ ion in the substitution site of ZnO lattice and as a similar transition for Co 2+ ion pair, respectively.

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Section: Resultsmentioning

confidence: 63%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-Frequency Raman Spectrum οf Bulk Zn_0.984Co_0.016O Crystal

et al. 2009

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“…have found that CoO‐related magnon peaks in the Co‐added ZnO crystal system. Szuszkiewicz et al . identified the LVM and CoO‐related magnons modes at low‐temperature regime.…”

Section: Resultsmentioning

confidence: 99%

“…The coexistence of CoO and ZnO phases were identified through low‐temperature Raman spectra by Millot et al . Szuszkiewicz et al . also observed the Co‐related local vibrational modes (LVM) in Co‐doped ZnO bulk crystals by Raman spectral measurements.…”

Section: Introductionmentioning

confidence: 99%

Birth of room‐temperature magnons and Raman line enhancement in ZnO nanostructures containing cobalt oxide

Pandiyarajan

Karthikeyan

2013

J Raman Spectroscopy

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Cobalt (Co) addition and thermal annealing induced structural and vibrational properties of ZnO nanostructures were analysed. X‐ray diffraction pattern reveals that the nanostructures are in hexagonal wurtzite type and the formation of Co3O4. The Co ion induced morphology changes have been studied by high‐resolution scanning electron microscope images and energy dispersive spectroscopy measurements confirm the presence of Co ions. CoO‐related magnon excitation bands are emerged at room temperature for the Co‐added samples. There are no changes in the band positions of the Raman spectra of pure and Co‐added materials. Annealed sample exhibits the suppression of magnon bands and formation of Co3O4: ZnO composites. Raman line width and the electron phonon coupling constant are decreased with respect to the annealing temperature. The formation of Co3O4 : ZnO composite phases have further confirmed by infrared spectra. Copyright © 2013 John Wiley & Sons, Ltd.

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Raman scattering as a tool to characterize semiconductor crystals, thin layers, and low-dimensional structures containing transition metals

Szuszkiewicz

Jouanne

Morhange

et al. 2013

Phys. Status Solidi B

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Raman scattering is well known as an efficient, nondestructive experimental method to study a variety of physical properties of semiconductors. The sensitivity of modern Raman spectroscopy is illustrated by several results obtained for semiconductor bulk crystals, thin layers, or low‐dimensional structures, containing selected transition metals. Among examples of Raman scattering data are detection of precipitates, a study of the influence of strain on phonon and magnon frequencies, and a search for magnetic excitations or for new phenomena, characteristic of low‐dimensional structures are described. The presented examples concern a few materials, which attract today or have attracted in the past a lot of attention. This selection is limited to Mn and Co impurities and to such well‐known semiconductor materials as MnTe, (Ga,Mn)As, ZnO, and ZnTe. Comparison of the efficiency of Raman scattering on LO phonons (bottom right) with the PL efficiency for a semiconductor superlattice (upper left). The PL contribution to the total intensity due to the Cd0.88Zn0.12Te substrate is also shown.

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Raman Spectroscopy of Co-Doped ZnO Bulk Crystals

Cited by 15 publications

References 18 publications

Low-Frequency Raman Spectrum οf Bulk Zn_0.984Co_0.016O Crystal

Low-Frequency Raman Spectrum οf Bulk Zn_0.984Co_0.016O Crystal

Birth of room‐temperature magnons and Raman line enhancement in ZnO nanostructures containing cobalt oxide

Raman scattering as a tool to characterize semiconductor crystals, thin layers, and low-dimensional structures containing transition metals

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Raman Spectroscopy of Co-Doped ZnO Bulk Crystals

Cited by 15 publications

References 18 publications

Low-Frequency Raman Spectrum οf Bulk Zn0.984Co0.016O Crystal

Low-Frequency Raman Spectrum οf Bulk Zn0.984Co0.016O Crystal

Birth of room‐temperature magnons and Raman line enhancement in ZnO nanostructures containing cobalt oxide

Raman scattering as a tool to characterize semiconductor crystals, thin layers, and low-dimensional structures containing transition metals

Contact Info

Product

Resources

About

Low-Frequency Raman Spectrum οf Bulk Zn_0.984Co_0.016O Crystal

Low-Frequency Raman Spectrum οf Bulk Zn_0.984Co_0.016O Crystal