Effect of Zn Substitution on Magnetic Properties of CuFe
                    <sub>2</sub>
                    O
                    <sub>4</sub>
                    : a High-Temperature Series Expansions Study

Salmi, S.; Masrour, R.; Grini, A. El; Bouslykhane, K.; Hourmatallah, A.; Benzakour, N.; Hamedoun, M.

doi:10.1088/0256-307x/35/1/017501

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…Jena et al studied the magnetic and dielectric behavior along with the exchange interactions for different concentrations of Zn diluted CuFe 2 O 4 ceramics [21,22]. Various numerical calculations pertaining to exchange interactions such as the Padé approximation based high temperature series expansion, ordering temperature and critical exponent (γ) are available for Ni 1−x Mg x Fe 2 O 4 and Cu 1−x Zn x Fe 2 O 4 spinel systems yet a systematic comparison with the experimentally obtained magnetization data is still lacking in the literature [23]. Alghamdi et al proposed that Cu 1−x Zn x Fe 2 O 4 magnetoceramics could serve as a prospective candidate in temperature sensors for magnetic resonance imaging thermometry [24].…”

Section: Introductionmentioning

confidence: 99%

The role of Zn and Ru substitution on the structural, magnetic and dielectric properties of ferrite cuprospinels

Roy-Chowdhury,

Jena,

Khadse

et al. 2023

J. Phys. D: Appl. Phys.

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A comprehensive study on the structural, magnetic and dielectric behavior of ferrite cuprospinels with site specific substitution of non-magnetic Zn and weakly magnetic Ru ions has been presented. Such substitution leads to two classes of stable crystal symmetries (i) Tetragonal (I41/amd): CuFe1.95Ru0.05O4 and Cu0.95Zn0.05Fe1.95Ru0.05O4 and (ii) Cubic (Fd-3m): Cu0.60Zn0.40Fe1.95Ru0.05O4 and Cu0.05Zn0.95Fe1.95Ru0.05O4 bulk polycrystals. The former set of compounds undergo significant Jahn-Teller (JT) distortion due to high Cu content and such distortion gets lifted with the substitution of non-magnetic Zn ions. Ferrimagnetic (FiM) behavior is predominant in all these compounds except the highest Zn (95 at%) content cubic system with diluted substitution of Ru (2.5 at%) which exhibits antiferromagnetic (AFM) ordering below the Néel temperature (TN ~ 10.9 K). We employed Néel’s expression for FiM systems applicable for the two sublattice model to extract the dominant exchange interactions (JAA, JAB and JBB) between the A-site and B-site cations. For the tetragonally distorted Zn diluted system exhibits JAA/kB ~391 K with very high asymptotic Curie temperature, while the Zn-rich cubic system exhibits JAA/kB ~ 300 K. On the other hand, the tetragonally distorted spinel devoid of Zn exhibits dominant JBB/kB ~ 229 K with negligible JAA/kB and moderate JAB/kB (65 K) signifying that the JT active ions cause the onset of magnetic frustration and enhanced ordering temperatures. The ac-resistivity ρ(f,T) studies reveal that the mode of conduction follows Mott’s variable-range hopping (VRH) model with a linear logarithmic variation of ρac versus T-0.25. The temperature dependence of the VRH activation energy (24.5 meV ≤ Ea-VRH ≤ 67 meV at T = 50 K and 94 meV ≤ Ea-VRH ≤ 257 meV at T = 300 K) of charge carriers follows a linear behavior which indicates the presence of localized polaron in all the investigated systems.

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Section: Introductionmentioning

confidence: 99%

The role of Zn and Ru substitution on the structural, magnetic and dielectric properties of ferrite cuprospinels

Roy-Chowdhury,

Jena,

Khadse

et al. 2023

J. Phys. D: Appl. Phys.

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Mechanism of the insulator-to-metal transition and superconductivity in the spin liquid candidate NaYbSe2 under pressure

Sheng

Yang

2022

npj Quantum Mater.

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The quantum spin liquid candidate NaYbSe2 was recently reported to exhibit a Mott transition under pressure. Superconductivity was observed in the high-pressure metallic phase, raising the question concerning its relation with the low-pressure quantum spin liquid ground state. Here we combine the density functional theory and the dynamical mean-field theory to explore the underlying mechanism of the insulator-to-metal transition and superconductivity and establish an overall picture of its electronic phases under pressure. Our results suggest that NaYbSe2 is a charge-transfer insulator at ambient pressure. Upon increasing pressure, however, the system first enters a semi-metallic state with incoherent Kondo scattering against coexisting localized Yb-4f moments, and then turns into a heavy-fermion metal. In between, there may exist a delocalization quantum critical point responsible for the observed non-Fermi liquid region with linear-in-T resistivity. The insulator-to-metal transition is therefore a two-stage process. Superconductivity emerges in the heavy-fermion phase with well-nested Yb-4f Fermi surfaces, suggesting that spin fluctuations may play a role in the Cooper pairing. NaYbSe2 might therefore be the 3rd Yb-based heavy-fermion superconductor with a very “high” Tc than most heavy-fermion superconductors.

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Electronic structure and magnetic exchange interactions in Zn diluted CuFe2O4 magneto-ceramics

Jena

Joshi

Yan

et al. 2020

Journal of Applied Physics

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We report a detailed study on the electronic structure and temperature (1.9K≤T≤900K) dependence of magnetization in Zn diluted cuprospinel [Cu1−xZnxFe2O4 (0≤x≤0.6)]. The electronic structure determined from the x-ray photoelectron spectroscopy and Rietveld analysis of the x-ray diffraction patterns reveals the structure to be (Cu(1−x)/5ZnxFe4(1−x)/5)A [Cu4(1−x)/5Fe2−4(1−x)/5]BO4. Beyond a specific dilution limit (0.05≤xp≤0.1), a sudden phase-change from tetragonal (I41/amd) to cubic (Fd3m) is noticed with an alteration in the A–O–A (3.29%) bond angle and A–O bond length (0.67%). Our analysis shows that all these compounds order ferrimagnetically below the Néel temperature (TFN) due to dissimilar site-specific magnitudes of spins, yet, they undergo a second transition at low temperatures T1∼66K with asymptotic Curie temperature TA(=C/χ0) as high as −547.2K for the undoped case. Dilution with Zn cause quadratic decay (b2x2+b1x+yo) of the ferrimagnetic ordering temperature from 743 K to 370.5 K for x=0 and 0.6, respectively. On the contrary, a significant increase in the saturation magnetization (MS) was observed with increasing x until the critical composition xc∼0.4 beyond which MS decreases continuously (MS=1.64μB and 4.73μB for x=0 and 0.4, respectively). From the temperature dependence of inverse paramagnetic susceptibility [χ−1(T>TFN)] data and Néel’s expression for ferrimagnets, we evaluated the molecular field constants and exchange interactions (J) between the tetrahedral A- and octahedral B-sites. A systematic compositional dependence of this analysis yields that JAB (∼25kB for x=0) is the dominant exchange interaction in comparison to JBB and JAA; however, JAB decreases significantly with increasing the composition (JAB∼−5.5kB for x=0.6). The isothermal magnetization data and law of approach to saturation analysis reveals that the investigated system possesses very high anisotropy field HK ≥5.5kOe with cubic anisotropy constant K1≥1.6×106erg/cc at xc.

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Effect of Zn Substitution on Magnetic Properties of CuFe ₂ O ₄ : a High-Temperature Series Expansions Study

Cited by 3 publications

References 23 publications

The role of Zn and Ru substitution on the structural, magnetic and dielectric properties of ferrite cuprospinels

The role of Zn and Ru substitution on the structural, magnetic and dielectric properties of ferrite cuprospinels

Mechanism of the insulator-to-metal transition and superconductivity in the spin liquid candidate NaYbSe2 under pressure

Electronic structure and magnetic exchange interactions in Zn diluted CuFe2O4 magneto-ceramics

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Effect of Zn Substitution on Magnetic Properties of CuFe 2 O 4 : a High-Temperature Series Expansions Study

Cited by 3 publications

References 23 publications

The role of Zn and Ru substitution on the structural, magnetic and dielectric properties of ferrite cuprospinels

The role of Zn and Ru substitution on the structural, magnetic and dielectric properties of ferrite cuprospinels

Mechanism of the insulator-to-metal transition and superconductivity in the spin liquid candidate NaYbSe2 under pressure

Electronic structure and magnetic exchange interactions in Zn diluted CuFe2O4 magneto-ceramics

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Product

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Effect of Zn Substitution on Magnetic Properties of CuFe ₂ O ₄ : a High-Temperature Series Expansions Study