Structural and compositional investigations of vapour grown CdTe:Cr single crystals

Popovych, V. D.; Sagan, P.; Bester, Mariusz; Cieniek, Bogumił; Kuźma, M.

doi:10.1016/j.jcrysgro.2015.05.034

Cited by 8 publications

(4 citation statements)

References 25 publications

(34 reference statements)

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“…On the (110)-oriented surfaces of the investigated samples we expectedly observed the same "unusual" defects in the form of parallel Cr 3 Te 4 needles, which were reported earlier [15,16]. At the same time, on the (111)-oriented samples facets features in the form of polygons were seen in the course of SEM patterning in addition to the needles (Fig.…”

Section: Resultssupporting

confidence: 83%

“…Details and condi-tions of the growth method and charge synthesis process were described elsewhere [15]. The results, presented in this paper, refer to the crystals grown from the charge with 5 at.% of chromium nominal content.…”

Section: Methodsmentioning

confidence: 99%

“…Our previous structural investigation confirmed the last supposition. Doping induced crystallographic phase separation was observed, resulting in the presence of CrTe-based defects in the form of sets of needle-like aggregates aligned parallel to the {111} crystallographic planes of zinc-blende structure [15]. It has been determined by energy-dispersive X-ray (EDX) profiling and high-angle annular dark-field (HAADF) elemental mapping that their chemical composition corresponds well with that of Cr 3 Te 4 phase [16], which is high-temperature ferromagnetic with the Curie temperature ranging from 315 to 340 K according to the literature data [17].…”

Section: Introductionmentioning

confidence: 99%

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Ferromagnetic Resonance in CdTe:Cr Single Crystals Containing Dopant-Related Macrodefects

et al. 2017

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We study CdTe:Cr single crystals grown by the physical vapor transport method from pre-synthesized (Cd,Cr)Te alloys with 5 at.% of chromium nominal content. Macrodefects in the form of (111)-oriented thin platelets of dopant-related second phases were detected by scanning electron microscopy patterning of the chemically treated surfaces of the crystals. Magnetic properties of the crystals were investigated by ferromagnetic resonance using X-band Bruker spectrometer (9.43 GHz). Their ferromagnetic resonance spectra show several broad lines, which position depends on the orientation of the sample in relation to the external magnetic field in spectrometer. The angular dependences of ferromagnetic resonance spectra are interpreted in the frame of shape anisotropy of ferromagnetic resonance of the planar defects embedded in a weak magnetic CdTe matrix.

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Section: Resultssupporting

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ferromagnetic Resonance in CdTe:Cr Single Crystals Containing Dopant-Related Macrodefects

et al. 2017

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“…29 Studies of Cr doped CdTe showed that the actual dopant content in the host lattice was strongly limited by poor chromium solubility in this compound. 30 The electronic and magnetic properties of Cr-doped Cd-chalcogenides have been investigated to search for new dilute magnetic semiconductor compounds suitable for spintronic applications. 31 The geometrical structures, bonding characteristics, Raman spectra, and molecular orbitals of hexagonal and tetrahedral Cr-doped CdX molecules have been investigated using density functional theory calculations at the B3LYP/LANL2DZ level.…”

Section: Structures and Optimised Parametersmentioning

confidence: 99%

Bonding and Spectral Character of Cr Doped Cdte, Cdse and Cds Nano-Clusters

Wang

et al. 2015

Journal of Chemical Research

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The geometrical structures, bonding characteristics, Raman spectra, and molecular orbitals of hexagonal and tetrahedral Cr-doped CdX molecules have been investigated using density functional theory calculations at the B3LYP/LANL2DZ level. The structures of Cr-doped CdX molecules had obvious distortions compared with pure CdX clusters, especially CdCr2Se3 and CdCr2S3 clusters. The Mulliken charges of Cr atoms were negative and were lower than those of Cd atoms in the corresponding structures. Raman spectra showed that there was the vibration of the Cr–Cr bond in Cr-doped CdX molecules. Wiberg bond indices (WBI) values show that there were Cr–Cr bonds in some clusters. WBI values have also revealed that bonds between Cr and Te, Se, S were stronger than those between Cd and X atoms. Finally, molecular orbital observations indicate that the transitions in doped structures were from d orbital to d orbital, which is different from undoped structures.

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