Spin glass behavior and critical analysis across the magnetic phase transition in Gd2CoMnO6: dc magnetization and ac susceptibility study

Bhatti, Ilyas Noor; Bhatti, Imtiaz Noor

doi:10.1016/j.cap.2022.04.007

Cited by 3 publications

(2 citation statements)

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“…Figure c compares |Δ S M | of GdSrCoFeO 6 with some recently reported cryogenic MCE materials ,,,,,− under ΔH = 5–7 T with working temperatures below 10 K. Indeed, the Δ S M value of GdSrCoFeO 6 is far from the best values reported, so it should be improved to compete with other materials already well-considered for cryogenic magnetocaloric applications. However, their working temperature moves toward values suitable for application in hydrogen liquefaction. , …”

Section: Resultsmentioning

confidence: 89%

Magnetoelastic Coupling and Cryogenic Magnetocaloric Effect in Two-Site Disordered GdSrCoFeO₆ Double Perovskite

et al. 2023

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The development of new magnetic refrigerants demands an effective investigation of materials with a large magnetocaloric effect in a wide temperature range. Herein, we report on the structural, magnetic, and magnetocaloric properties of the two-site disordered double perovskite GdSrCoFeO 6 prepared by the modified solid-state synthesis method. Temperature-dependent synchrotron X-ray diffraction analysis revealed that GdSrCoFeO 6 crystallizes in the orthorhombic phase (Pnma), with Gd 3+ /Sr 2+ and Co 2+/3+ /Fe 3+/4+ ions randomly distributed on the A-and B-sites, respectively. An observed lattice parameter anomaly around 60 K indicates the occurrence of the magnetoelastic coupling, which coincides with the presence of ferro/ferrimagnetic (FM/FiM) ordering below T C ≈ 65 K from the magnetic measurements. These results match well with our first-principles calculation prediction of low-temperature magnetic (FM/FiM) and electronic (insulating/metal) transitions related to a combined effect of Co and Fe shortand long-range competitions, crossings of spin state at Co ions, and the hybridization degree between Gd-4f and Co-3d states. Additionally, a modified Arrott plot and Kouvel−Fisher analysis were used to establish the nature of the magnetic phase transition in GdSrCoFeO 6 , yielding the critical exponent β = 1.46(6)/1.45(6), γ = 1.48(5)/1.17(2), and δ = 2.01(3)/1.80(5), respectively. The specific heat analysis reveals two well-defined broad peaks (∼10 and ∼70 K), which match well with a Schottky anomaly (Gd-4f) and the magnetic transition of FM/FiM to paramagnetic order, respectively. The magnetocaloric effect (MCE) analysis reveals a maximum magnetic entropy change ΔS M max ≈ 13 J kg −1 K −1 (at ∼8 K) under a field of 0−7 T. These results evidence that the Schottky anomaly and the magnetoelastic coupling seem to be key factors for driving further enhancements to the MCE in GdSrCoFeO 6 , making it a possible candidate for cryogenic applications.

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Section: Resultsmentioning

confidence: 89%

Magnetoelastic Coupling and Cryogenic Magnetocaloric Effect in Two-Site Disordered GdSrCoFeO₆ Double Perovskite

et al. 2023

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“…The ac susceptibility peak shifts 0.1 K for 3 decades of change in frequency. This shift was analyzed with the critical dynamics scaling model (power law), given by the formula τ = τ 0 ( T / T sg – 1) − z ν . , The fitting procedure gave physically unreasonable parameters. So, this analysis indicates the absence of a spin-glass-like phase at low temperatures.…”

Section: Methodsmentioning

confidence: 99%

Increasing the Magnetic Order Temperature in Co₃O₂BO₃:In Ludwigite

Mariano,

Candela,

Freitas

et al. 2023

Inorg. Chem.

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Below 42 K, the homometallic Co 3 O 2 BO 3 ludwigite forms magnetic planes separated by nonmagnetic low-spin Co 3+ ions. The substitution of Co 3+ by other nonmagnetic ions enhances the magnetic interactions, raising the magnetic ordering temperature. However, depending on the nonmagnetic dopant ion, the remaining Co 3+ ions could adopt a high-spin state, creating magnetic frustration and lowering the magnetic transition temperature. Doping Co 3 O 2 BO 3 with nonmagnetic In 3+ ions favors the appearance of both high-spin Co 2+ and Co 3+ . The In 3+ ions preferentially occupy sites 4 and are randomly distributed in each site. The two-dimensional magnetic character of the parent compound, Co 3 O 2 BO 3 , is preserved, and the magnetic transition temperature increases to 47.8 K. Measurements of magnetization, which show metamagnetic transitions at low temperatures, and specific heat are consistent with ferrimagnetic ordering in this system. Thus, using these results and those reported in the literature, the effects caused by doping of Co 3 O 2 BO 3 with different nonmagnetic +3 ions are discussed in terms of the presence of high-spin Co 2+ and Co 3+ in the compounds.

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Magnetic complexity, magnetodielectric effect and DFT calculations on correlation driven Gd2CoMnO6 insulator

Prashanth

Reddy

Tarafder

et al. 2022

Journal of Magnetism and Magnetic Materials

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Spin glass behavior and critical analysis across the magnetic phase transition in Gd2CoMnO6: dc magnetization and ac susceptibility study

Cited by 3 publications

References 46 publications

Magnetoelastic Coupling and Cryogenic Magnetocaloric Effect in Two-Site Disordered GdSrCoFeO₆ Double Perovskite

Magnetoelastic Coupling and Cryogenic Magnetocaloric Effect in Two-Site Disordered GdSrCoFeO₆ Double Perovskite

Increasing the Magnetic Order Temperature in Co₃O₂BO₃:In Ludwigite

Magnetic complexity, magnetodielectric effect and DFT calculations on correlation driven Gd2CoMnO6 insulator

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Spin glass behavior and critical analysis across the magnetic phase transition in Gd2CoMnO6: dc magnetization and ac susceptibility study

Cited by 3 publications

References 46 publications

Magnetoelastic Coupling and Cryogenic Magnetocaloric Effect in Two-Site Disordered GdSrCoFeO6 Double Perovskite

Magnetoelastic Coupling and Cryogenic Magnetocaloric Effect in Two-Site Disordered GdSrCoFeO6 Double Perovskite

Increasing the Magnetic Order Temperature in Co3O2BO3:In Ludwigite

Magnetic complexity, magnetodielectric effect and DFT calculations on correlation driven Gd2CoMnO6 insulator

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Magnetoelastic Coupling and Cryogenic Magnetocaloric Effect in Two-Site Disordered GdSrCoFeO₆ Double Perovskite

Magnetoelastic Coupling and Cryogenic Magnetocaloric Effect in Two-Site Disordered GdSrCoFeO₆ Double Perovskite

Increasing the Magnetic Order Temperature in Co₃O₂BO₃:In Ludwigite