Room temperature antiferromagnetic ordering in chemically prepared nanocrystalline Co-doped neodymium oxide (Nd1.90Co0.10O3-δ)

Sarkar, B. J.; Dalal, Madhumita; Mitra, A.; Mandal, Joydeb; Bandyopadhyay, A.; Chakrabarti, P.K.

doi:10.1016/j.jallcom.2018.04.080

Cited by 13 publications

(11 citation statements)

References 27 publications

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“…Similar magnetic behaviors were also found in some dilute magnetic semiconductor materials. [ 36 ] Sarkar et al reported room temperature antiferromagnetic of Nd 1.90 Co 0.10 O 3− δ nanocrystalline and confirmed that the antiferromagnetic to ferromagnetic phase transition occurs at about 100 K. [ 28 ] Fe x Cr 2− x O 3 nanoparticles were reported to have the same magnetic transition and confirmed that oxygen defects are a key factor to induce magnetic behavior by the bound magnetic polaritons (BMP) model. [ 37 ] In Figure 4, the BMP model is applied to further analyze the origin of the magnetic transition.…”

Section: Resultsmentioning

confidence: 97%

“…As the temperature changes, the macroscopic magnetic properties change accordingly. To explain the phenomenon, we have fitted the χ–T curves under an external magnetic field of 5000 Oe in this temperature range using the Johnston model, [ 27,28 ] according to which the susceptibility as a function of temperature is given by

\chi = \left(\chi\right)_{\text{AFM}} + \frac{C}{T} + \left(\chi\right)_{0}

where χ AFM accounts for the antiferromagnetic contribution, the paramagnetic contribution is described by the second term, and χ 0 is temperature‐independent contribution to the susceptibility. The antiferromagnetic contribution can also be written as

\left(\chi\right)_{\text{AFM}} = \frac{C_{\text{AF}}}{T + T_{\text{N}}}

…”

Section: Resultsmentioning

confidence: 99%

“…Thus, we use the combined Curie–Weiss and spin‐wave behavior to explain that the sample is in a mixed state of ferromagnetic and paramagnetic phases. [ 28–31 ] The magnetization of samples is analyzed by the combined formula

$$\chi \left(\right. T \left.\right) = \frac{C}{T - \theta} + \frac{M_{0}}{H} \left(\right.

…”

Section: Resultsmentioning

confidence: 99%

“…[ 37 ] In Figure 4, the BMP model is applied to further analyze the origin of the magnetic transition. The M–H curves can be fitted by the following formula [ 27–29,37 ]

$$M \left(\right. H \left.\right) = M_{0} L \left(\right.

…”

Section: Resultsmentioning

confidence: 99%

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Crystal Growth and Physical Properties Evolution in Co‐Doped NiTe₂ System

Chen

Gao

et al. 2023

Physica Status Solidi (b)

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Transition metal tellurides have been widely studied for their diverse crystal structures and exotic physical properties such as large magnetoresistance, charge density waves, superconductivity, ferromagnetic and topological properties. NiTe2 has recently been found to be a Dirac semimetal, allowing it to achieve exotic properties by pressure and doping. A series of Ni1−xCoxTe2−δ single crystals are synthesized by the standard solid‐state reaction method. The energy‐dispersive X‐ray spectroscopy and X‐ray diffraction tests confirm Co is successfully doped into the crystal structure. The electrical transport measurements show typical metallic behaviors for all the samples. Magnetization measurements reveal that, in the doping range of x = 0.12–0.62, the samples exhibit a coexistence of antiferromagnetic and paramagnetic phases above the characteristic temperature Tt. By using the combined Curie–Weiss and spin‐wave model, the antiferromagnetic to ferromagnetic transition is found to occur as the temperature drops below Tt. The magnetic transition is attributed to the Te vacancies, which can be explained using the bound magnetic polaritons model. A magnetic phase diagram for Ni1−xCoxTe2−δ system is constructed.

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Section: Resultsmentioning

confidence: 97%

\chi = \left(\chi\right)_{\text{AFM}} + \frac{C}{T} + \left(\chi\right)_{0}

\left(\chi\right)_{\text{AFM}} = \frac{C_{\text{AF}}}{T + T_{\text{N}}}

…”

Section: Resultsmentioning

confidence: 99%

$$\chi \left(\right. T \left.\right) = \frac{C}{T - \theta} + \frac{M_{0}}{H} \left(\right.

…”

Section: Resultsmentioning

confidence: 99%

“…[ 37 ] In Figure 4, the BMP model is applied to further analyze the origin of the magnetic transition. The M–H curves can be fitted by the following formula [ 27–29,37 ]

$$M \left(\right. H \left.\right) = M_{0} L \left(\right.

…”

Section: Resultsmentioning

confidence: 99%

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Crystal Growth and Physical Properties Evolution in Co‐Doped NiTe₂ System

Chen

Gao

et al. 2023

Physica Status Solidi (b)

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“…The negative θ values of CNSD and NNSD samples display antiferromagnetic (AFM) property; the same has been reported earlier (64). In various oxide systems, the emergence of ferromagnetic (FM) behaviour arises from vacancies/ defects in the lattice, due to several aspects like mismatch of ionic radius, valence state of doped material and oxygen vacancies attributing towards superexchange interaction or bound magnetic polaron (BMP) (Sarkar et al 2018a;Griffin et al 2005). BMP model is used to determine the presence of both AFM and FM behaviour at low temperatures.…”

Section: Resultsmentioning

confidence: 99%

A thermomagnetic analysis of an eco-friendly nano-sized dysprosia for energy efficient cryo-cooling systems

Jaison

Sundararaj

et al. 2021

J Nanopart Res

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metal ions, which play a major role in the structural distortion of doped NSDs. The magnetic studies of NSDs revealed that antiferromagnetic and ferromagnetic properties exhibited predominantly at low temperature, whereas at high-temperature, paramagnetic properties are observed. It was also found that the magnetic entropy change of NSDs at the applied magnetic field is comparatively higher, making them a suitable material for eco-friendly cryogenic systems. KeywordsNano-sized dysprosia (NSD) • Co-doped nano-sized dysprosia (CNSD) • Ni-doped nanosized dysprosia (NNSD) • Magnetocaloric effect • Magnetisation

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Oxygen defects induced tailored optical and magnetic properties of FexCr2−xO3 (0 ≤ x ≤ 0.1) nanoparticles

et al. 2022

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Room temperature antiferromagnetic ordering in chemically prepared nanocrystalline Co-doped neodymium oxide (Nd1.90Co0.10O3-δ)

Cited by 13 publications

References 27 publications

Crystal Growth and Physical Properties Evolution in Co‐Doped NiTe₂ System

Crystal Growth and Physical Properties Evolution in Co‐Doped NiTe₂ System

A thermomagnetic analysis of an eco-friendly nano-sized dysprosia for energy efficient cryo-cooling systems

Oxygen defects induced tailored optical and magnetic properties of FexCr2−xO3 (0 ≤ x ≤ 0.1) nanoparticles

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Room temperature antiferromagnetic ordering in chemically prepared nanocrystalline Co-doped neodymium oxide (Nd1.90Co0.10O3-δ)

Cited by 13 publications

References 27 publications

Crystal Growth and Physical Properties Evolution in Co‐Doped NiTe2 System

Crystal Growth and Physical Properties Evolution in Co‐Doped NiTe2 System

A thermomagnetic analysis of an eco-friendly nano-sized dysprosia for energy efficient cryo-cooling systems

Oxygen defects induced tailored optical and magnetic properties of FexCr2−xO3 (0 ≤ x ≤ 0.1) nanoparticles

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Product

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Crystal Growth and Physical Properties Evolution in Co‐Doped NiTe₂ System

Crystal Growth and Physical Properties Evolution in Co‐Doped NiTe₂ System