The spin glass behaviour of disordered spinel ferrite Co<sub>2</sub>TiO<sub>4</sub>

Srivastava, J. K.; Kulkarni, J.A.; Ramakrishnan, S.; Singh, Sobhit; Marathe, V. R.; Chandra, Girish; Darshane, V. S.; Vijayaraghavan, R.

doi:10.1088/0022-3719/20/14/015

Cited by 28 publications

(16 citation statements)

References 24 publications

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“…Although a number of papers have previously reported on the nature of magnetism in Co 2 TiO 4 , the results have been controversial. The magnetic studies of Hubsch and Gavoille [17] and Gavoille et al [18] reported ferrimagnetic ordering at T N ∼ 55 K followed by spin-glass transition at T SG ∼ 46 K. However, later ac susceptibility studies by Srivastava et al [19], showed no indication of T N ∼ 55 K, rather only a single peak in χ ac near 48 K when H dc = 0. In the studies of the temperature dependence of specific heat C p of Co 2 TiO 4 by Ogawa and Waki [20], only a weak peak in C p vs T was reported near 49 K, which was associated with magnetic ordering, again signaling the absence of a transition near 55 K. The magnetic studies by Hubsch and Gavoille also showed a magnetic compensation point near 30 K [17].…”

Section: Introductionmentioning

confidence: 96%

Magnetic compensation, field-dependent magnetization reversal, and complex magnetic ordering inCo2TiO4

et al. 2015

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The complex nature of magnetic ordering in the spinel Co 2 TiO 4 is investigated by analyzing the temperature and magnetic field dependence of its magnetization (M), specific heat (C p ), and ac magnetic susceptibilities χ and χ . X-ray diffraction of the sample synthesized by the solid-state reaction route confirmed the spinel structure whereas x-ray photoelectron spectroscopy shows its electronic structure to be

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Section: Introductionmentioning

confidence: 96%

Magnetic compensation, field-dependent magnetization reversal, and complex magnetic ordering inCo2TiO4

et al. 2015

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“…Despite the various reports available, a systematic study of Ti‐doped

{Co}_{3} O_{4}

or the solid solutions of

{Co}_{3} O_{4}

and

{Co}_{2} {TiO}_{4}

are not initiated in the literature as yet. On the other hand, the inverse spinel cobalt‐orthotitanate

{Co}_{2} {TiO}_{4}

= (

{Co}^{2 +}

[

{Ti}^{4 +} {Co}^{2 +}

]

O_{4}

) that belongs to the inverse‐spinel family is considered to be an interesting system because of its re‐entrant ferrimagnetic behavior . Although there is a fair amount of literature existing on the magnetic characteristics of

{Co}_{2} {TiO}_{4}

, only a few reports are available dealing with its physical/chemical properties other than magnetic properties of this compound .…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic studies of Co₂TiO₄ and Co₃O₄ two‐phase composites

Nayak

Dasari

Joshi

et al. 2016

Physica Status Solidi (b)

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In this article, we report a comparative analysis of various spectroscopic studies including low‐temperature (25thinmathspacenormalKthinmathspace≤T≤300normalK) Raman spectroscopy of cobalt‐orthotitanate (Co2TiO4) and tricobalt‐tetraoxide (Co3O4), and their solid solutions false(1−xfalse) Co3O4+x of Co2TiO4 (0≤x≤1 (100 wt.%)). For all the lower and intermediate compositions, five Raman‐active modes were recognized at 689, 618, 518, 480, and 195cm−1 that are associated with A1g, Eg, and 3F2g phonon symmetries. Conversely, pure Co2TiO4 exhibits a broad spectrum of width ∼93.3cm−1 without any signatures of F2g(3) mode. At low‐temperatures (down to 25 K) the A1g and F2g peaks of both Co2TiO4 and Co3O4 shift toward the high‐frequency side with anomalies across the ferrimagnetic Néel temperature (TN ∼48±5K) and antiferromagnetic Néel temperature (TN∼ 30 ± 10 K), respectively. All the investigated samples exhibit two distinct bands at 576cm−1 (B1) and 665cm−1 (B2) in the Fourier transform infrared spectra recorded at 300±10 K, associated with the vibrational stretching of the metal–oxygen bonds of length ∼195.8 pm (B–O) and ∼185.4 pm (A–O), respectively. The intensity of these sharp bands gradually decreases as the crystal structure transforms from normal‐spinel (a=8.07 Å) to inverse‐spinel structure (a=8.45 Å). The X‐ray photoelectron spectroscopy (XPS) studies revealed that the Ti was incorporated into the octahedral B‐sites of inverse‐spinel structure of Co2TiO4. Interestingly, the XPS spectra of Co2TiO4 provide evidence of the trivalent character of Ti instead of tetravalent cationic configuration together with a weak Co3+ character at the octahedral sites. These results are discussed in terms of the binding‐energy (BE) difference between the O‐1s and Ti‐2p3/2 (Δ[O–Ti‐2p3/2] = BE(O‐1s) −BE(Ti‐2p3/2false)) and the mean chemical bond length lfalse[italicTi−Ofalse]. The peculiarities of all these results in consonance with the crystal‐structure (bond angles and bond lengths) and electron‐spin‐resonance studies are discussed in detail.

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“…x 0.875. One end member (x = 1) of this series is diamagnetic Li 1.33 Ti 1.67 O 4 and has excellent properties as an anode material in lithium rechargeable batteries [3], while Co 2 TiO 4 (x = 0) possesses unusual magnetic properties [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the spinel compound Co 2 RuO 4 undergoes a spin glass transition at 16 K as a result of competing A-A and A-B interactions [7]. In that sense, Co 2 TiO 4 spinel is a highly interesting system with rich magnetic behaviour: (i) DC magnetization measurements revealed re-entrant magnetic properties with a paramagnetic-ferrimagnetic transition at T N = 55 K and formation of a spin glass phase at T SG = 46 K [4]; (ii) another study done by the AC susceptibility technique has detected five peaks in the magnetic susceptibility versus temperature curve in the 1.7-50 K range [5].…”

Section: Introductionmentioning

confidence: 99%

Spin glass formation in Li-substituted Co₂TiO₄spinel

Antić¹,

Goya

Rechenberg

et al. 2004

J. Phys.: Condens. Matter

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DC magnetization and AC susceptibility measurements point to the formation of a spin glass state in the ternary spinel-type compounds Li 1.33x Co 2−2x Ti 1+0.67x O 4. The dynamics of spin freezing was analysed with both the critical slowing down and the thermally activated dynamics models. The parameter values obtained, as well as the behaviour of the zero-field-cooled and field-cooled magnetization as a function of temperature, indicate the existence of a cluster glass state in disordered spinel samples with x = 0.25 and 0.40, and probably also in the ordered spinel with x = 0.50. Ordered spinel samples with x = 0.75 and 0.875 were found to be paramagnetic down to the temperature of 1.7 K with a random distribution of Co 2+ ions.

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The spin glass behaviour of disordered spinel ferrite Co₂TiO₄

Cited by 28 publications

References 24 publications

Magnetic compensation, field-dependent magnetization reversal, and complex magnetic ordering inCo2TiO4

Magnetic compensation, field-dependent magnetization reversal, and complex magnetic ordering inCo2TiO4

Spectroscopic studies of Co₂TiO₄ and Co₃O₄ two‐phase composites

Spin glass formation in Li-substituted Co₂TiO₄spinel

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The spin glass behaviour of disordered spinel ferrite Co2TiO4

Cited by 28 publications

References 24 publications

Magnetic compensation, field-dependent magnetization reversal, and complex magnetic ordering inCo2TiO4

Magnetic compensation, field-dependent magnetization reversal, and complex magnetic ordering inCo2TiO4

Spectroscopic studies of Co2TiO4 and Co3O4 two‐phase composites

Spin glass formation in Li-substituted Co2TiO4spinel

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The spin glass behaviour of disordered spinel ferrite Co₂TiO₄

Spectroscopic studies of Co₂TiO₄ and Co₃O₄ two‐phase composites

Spin glass formation in Li-substituted Co₂TiO₄spinel