Electrical transport and magnetic properties of cobalt telluride nanostructures

Dahal, Bishnu; Dulal, Rajendra; Pegg, Ian L.; Philip, John

doi:10.1116/1.4959576

Cited by 18 publications

(22 citation statements)

References 17 publications

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“…3,15,18 The second issue concerns the source of the magnetism observed in recent studies on nanostructured CoTe x materials. [9][10][11][12][13] Wang et al 1 carried out high-resolution x-ray photoelectron spectroscopy (XPS) on cobalt telluride branched nanostructured samples. They observed weak satellite peaks in their Co 2p 3/2 /2p 1/2 spectra which they attribute to elemental Co. 1 Wu et al 5 observed second phase fcc Co peaks in their XRD patterns from carbon supported CoTe 1.20 nanoparticles; the second phase peaks were reduced for higher heat treatment temperatures.…”

Section: Discussionmentioning

confidence: 99%

“…However, there are still several recent reports in the literature of Co-Te nanostructured materials having the CoTe stoichiometry and being magnetic. [9][10][11][12][13] One such study reports CoTe nanowires a wells@phys.uconn.edu which exhibit ferrimagnetic behavior well above room temperature with a saturation magnetization of 0.2 µ B /Co. 10 Another report concerning CoTe nanotubes shows hysteresis loops with coercivity indicating ferromagnetic behavior.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12][13] One such study reports CoTe nanowires a wells@phys.uconn.edu which exhibit ferrimagnetic behavior well above room temperature with a saturation magnetization of 0.2 µ B /Co. 10 Another report concerning CoTe nanotubes shows hysteresis loops with coercivity indicating ferromagnetic behavior. 11 A magnetic transition from paramagnetism to ferrimagnetism at approximately 40 K has been seen in Co-rich CoTe 0.79 nanostructures.…”

Section: Introductionmentioning

confidence: 99%

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Direct evidence for the source of reported magnetic behavior in “CoTe”

et al. 2017

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In order to unambiguously identify the source of magnetism reported in recent studies of the Co-Te system, two sets of high-quality, epitaxial CoTex films (thickness ≈ 300 nm) were prepared by pulse laser deposition (PLD). X-ray diffraction (XRD) shows that all of the films are epitaxial along the [001] direction and have the hexagonal NiAs structure. There is no indication of any second phase metallic Co peaks (either fcc or hcp) in the XRD patterns. The two sets of CoTex films were grown on various substrates with PLD targets having Co:Te in the atomic ratio of 50:50 and 35:65. From the measured lattice parameters c = 5.396 Å for the former and c = 5.402 Å for the latter, the compositions CoTe1.71 (63.1% Te) and CoTe1.76 (63.8% Te), respectively, are assigned to the principal phase. Although XRD shows no trace of metallic Co second phase, the magnetic measurements do show a ferromagnetic contribution for both sets of films with the saturation magnetization values for the CoTe1.71 films being approximately four times the values for the CoTe1.76 films. 59 Co spin-echo nuclear magnetic resonance (NMR) clearly shows the existence of metallic Co inclusions in the films. The source of weak ferromagnetism reported in several recent studies is due to the presence of metallic Co, since the stoichiometric composition "CoTe" does not exist.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Direct evidence for the source of reported magnetic behavior in “CoTe”

et al. 2017

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“…Nanocomposites comprise a dimensional order class of nanomaterials, they can be formed by two or more atoms adding and improving the physical-chemical properties of the constituent elements [2], [3]. Several studies carried out through applications of nanocomposites based on cobalt, silicon or tellurium have shown promise because of the excellent properties acquired or improved due to the joining of these elements, however a structure constituted from the three elements Co x Si y Te z is still unknown, presenting short report in scientific literature or crystallographic database [4] - [6].…”

Section: …………………………………………………………………………………………………… Introduction:-mentioning

confidence: 99%

Coxsiytez Nanocomposite Manufacture by Solution Combustion Process Assisted by Micro-Wave

Bezerra¹,

Porto²,

Santos³

2020

IJAR

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A possible formation of the nanocomposite based on silicon, cobalt and tellurium was produced by the combustion synthesis process in solution (SCS) assisted by microwave in two stages, combustion using a conventional microwave oven and purification by means of calcination at 650 ºC in a muffle furnace. The new material was developed in different oxidant-fuel relationships where it observed the effects on the evolution of the phase and morphology of the powders, the structural, morphological and thermal properties were investigated by the X-ray diffraction technique (XRD), energy dispersive X-ray spectroscopy (EDX) coupled to the scanning electron microscope (SEM) and TGA and DTG curves. Through the analysis it is possible to suggest the development of a new stable material in single phase, being isostructural to the Co8Te12O32 (ICDD-50702) of nanometric dimensions with interesting potentials due to the properties of the constituent elements.

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“…Such change of resistivity can only be found in semimetals or narrow gap semiconductors 23–26 . The logarithm of resistivity behavior above 200 K plotted against 1/T as shown in the inset can be fitted with a straight line, yielding an effective energy gap of 24 meV 27,28 . For temperatures lower than 200 K, the temperature dependence of resistivity can be written as .…”

Section: Introductionmentioning

confidence: 99%

Weak localization and small anomalous Hall conductivity in ferromagnetic Weyl semimetal Co2TiGe

Dulal

Dahal

Forbes

et al. 2019

Sci Rep

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Several cobalt-based Heusler alloys have been predicted to exhibit Weyl Semimetal behavior due to time reversal symmetry breaking. Co 2 TiGe is one of the predicted ferromagnetic Weyl semimetals. In this work, we report weak localization and small anomalous Hall conductivity in half-metallic Co 2 TiGe thin films grown by molecular beam epitaxy. The longitudinal resistivity shows semimetallic behavior. Elaborate analysis of longitudinal magnetoconductance shows the presence of a weak localization quantum correction present even up to room temperature and reduction in dephasing length at lower temperature. Negative longitudinal magnetoresistance is observed from 5 to 300 K, but at 300 K magnetoresistance becomes positive above 0.5 T magnetic field. The anomalous Hall effect has been investigated in these thin films. The measured anomalous Hall conductivity decreases with increasing temperature, and a small anomalous Hall conductivity has been measured at various temperatures which may be arising due to both intrinsic and extrinsic mechanisms.

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Electrical transport and magnetic properties of cobalt telluride nanostructures

Cited by 18 publications

References 17 publications

Direct evidence for the source of reported magnetic behavior in “CoTe”

Direct evidence for the source of reported magnetic behavior in “CoTe”

Coxsiytez Nanocomposite Manufacture by Solution Combustion Process Assisted by Micro-Wave

Weak localization and small anomalous Hall conductivity in ferromagnetic Weyl semimetal Co2TiGe

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