Magnetization and magneto-transport staircaselike behavior in layered perovskite Sr2CoO4 at low temperature

Li, Qiuhang; Yuan, Xueping; Liu, Xing; Xu, Mingxiang

doi:10.1038/srep27712

Cited by 12 publications

(4 citation statements)

References 42 publications

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“…Their results are further supported by the simulations studies of simple Ising Hamiltonian with in-plane ferromagnetic interactions and randomly mixed off-plane interactions [77,78]. Likewise, Li et al [79] reported that the staircase-like behavior observed in the M-H curves at low temperature in layered perovskite Sr 2 CoO 4 is due to the avalanche of flipping domains in terms of the random field theory.…”

Section: Composition and Temperature Dependence Of Hysteresis Loop Pa...mentioning

confidence: 72%

Effects of Cu doping on the electronic structure and magnetic properties of MnCo₂O₄nanostructures

Pramanik

Thota

Singh

et al. 2017

J. Phys.: Condens. Matter

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Reported here are the results and their analysis from our detailed investigations of the effects of Cu doping ([Formula: see text]) on the electronic structure and magnetic properties of the spinel [Formula: see text]O. A detailed comparison is given for the [Formula: see text] and [Formula: see text] cases for both the bulk-like samples and nanoparticles. The electronic structure determined from x-ray photoelectron spectroscopy and Rietveld analysis of x-ray diffraction patterns shows the structure to be: ([Formula: see text]) [Formula: see text] [Formula: see text] [Formula: see text]] [Formula: see text] i.e. [Formula: see text] substitutes for [Formula: see text] on the octahedral B-sites. For the bulk samples, the ferrimagnetic [Formula: see text] K for [Formula: see text] is lowered to [Formula: see text] K for the [Formula: see text] sample, this decrease being due to the effect of Cu doping. For the nanosize [Formula: see text] ([Formula: see text]) sample, the lower [Formula: see text] K ([Formula: see text] K) is observed using [Formula: see text] analysis, this lowering being due to finite size effects. For [Formula: see text], fits of dc paramagnetic susceptibility data of [Formula: see text] versus T in nanosize samples to the Néel expression are used to determine the exchange interactions between the A and B sites with exchange constants: [Formula: see text] K (4.1 K), [Formula: see text] K (16.3 K) and [Formula: see text] K (13.8 K) for [Formula: see text]. The temperature dependence of ac susceptibilities [Formula: see text] and [Formula: see text] at different frequencies shows that in bulk samples of [Formula: see text] and [Formula: see text], the transition at T is the normal second order transition. But for the nanosize [Formula: see text] and 0.2 samples, analysis of the ac susceptibilities shows that the ferrimagnetic transition at T is followed by a re-entrant spin-glass transition at lower temperatures [Formula: see text] K (138 K) for [Formula: see text] ([Formula: see text]). Analysis of the ac susceptibilities, [Formula: see text] and [Formula: see text], versus T data is done in terms of two scaling laws: (i) Vogel-Fulcher law [Formula: see text] [Formula: see text]; and (ii) power law of critical slowing-down [Formula: see text]. These fits confirm the existence of glassy behavior below T with the parameters [Formula: see text] (8.91), [Formula: see text] (9.6 × 10[Formula: see text]) and [Formula: see text] K (∼138 K) for the samples [Formula: see text] (0.2), with similar results obtained for other samples. The linear behavior of the peak maximum in [Formula: see text] versus [Formula: see text] (AT-line) further supports the existence of glassy states in nanosize samples. For [Formula: see text], the temperature and composition dependence of the hysteresis loop parameters are investigated; all the samples with x ⩾ 0.1 have the coercivity H and remanence [Formula: see text]. Since the results reported here in these nanostructures are significantly different from those in bulk [...

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Section: Composition and Temperature Dependence Of Hysteresis Loop Pa...mentioning

confidence: 72%

Effects of Cu doping on the electronic structure and magnetic properties of MnCo₂O₄nanostructures

Pramanik

Thota

Singh

et al. 2017

J. Phys.: Condens. Matter

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“…[17][18][19][20][21][22] With further reduction, BM SrFeO2.5 films could transform to infinite-layer SrFeO2 SP phase. [21,23] However, in the cobaltite system, further reduction of BM SrCoO2.5 films led to amorphous films or nano-twinned, tetrahedrally-coordinated phases [22,24] rather than the formation of SrCoO2 SP phase or even the Sr2CoO4 [25,26] Ruddlesden-Popper phase. Therefore, this work investigates the mechanisms and the phase stability associated with cobaltite topotactic transformations.…”

Section: Introductionmentioning

confidence: 99%

Cation and anion topotactic transformations in cobaltite thin films leading to Ruddlesden-Popper phases

Chiu

Lee

Cheng

et al. 2021

Phys. Rev. Materials

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Topotactic transformations involve structural changes between related crystal structures due to a loss or gain of material while retaining a crystallographic relationship. 2The perovskite oxide La0.7Sr0.3CoO3 (LSCO) is an ideal system for investigating phase transformations due to its high oxygen vacancy conductivity, relatively low oxygen vacancy formation energy, and strong coupling of the magnetic and electronic properties to the oxygen stoichiometry. While the transition between cobaltite perovskite and brownmillerite (BM) phases has been widely reported, further reduction beyond the BM phase lacks systematic studies. In this work, we study the evolution of the physical properties of LSCO thin films upon exposure to highly reducing environments. We observe the rarely-reported crystalline Ruddlesden-Popper (RP) phase, which involves the loss of both oxygen anions and cobalt cations upon annealing where the cobalt is found as isolated Co ions or Co nanoparticles. First principles calculations confirm that the concurrent loss of oxygen and cobalt ions is thermodynamically possible through an intermediary BM phase. The strong correlation of the magnetic and electronic properties to the crystal structure highlights the potential of utilizing ion migration as a basis for emerging applications such as neuromorphic computing.

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“…The difference to the theoretically expected magnetic moment of 9 μB/Tb-atom could be due to crystal electric field effects but also indicate strong pinning of the ferromagnetic domains. 42 Indeed, M(H) curves of Tb4Co2C3 measured at 2 K reveal an unusual stair-like behaviour (inset in Fig. 9) which has completely disappeared at 10 K (Fig.…”

Section: Physical Propertiesmentioning

confidence: 93%

Crystal, electronic and magnetic structures of a novel series of intergrowth carbometalates R₄Co₂C₃ (R = Y, Gd, Tb)

et al. 2021

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Magnetization and magneto-transport staircaselike behavior in layered perovskite Sr2CoO4 at low temperature

Cited by 12 publications

References 42 publications

Effects of Cu doping on the electronic structure and magnetic properties of MnCo₂O₄nanostructures

Effects of Cu doping on the electronic structure and magnetic properties of MnCo₂O₄nanostructures

Cation and anion topotactic transformations in cobaltite thin films leading to Ruddlesden-Popper phases

Crystal, electronic and magnetic structures of a novel series of intergrowth carbometalates R₄Co₂C₃ (R = Y, Gd, Tb)

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Magnetization and magneto-transport staircaselike behavior in layered perovskite Sr2CoO4 at low temperature

Cited by 12 publications

References 42 publications

Effects of Cu doping on the electronic structure and magnetic properties of MnCo2O4nanostructures

Effects of Cu doping on the electronic structure and magnetic properties of MnCo2O4nanostructures

Cation and anion topotactic transformations in cobaltite thin films leading to Ruddlesden-Popper phases

Crystal, electronic and magnetic structures of a novel series of intergrowth carbometalates R4Co2C3 (R = Y, Gd, Tb)

Contact Info

Product

Resources

About

Effects of Cu doping on the electronic structure and magnetic properties of MnCo₂O₄nanostructures

Effects of Cu doping on the electronic structure and magnetic properties of MnCo₂O₄nanostructures

Crystal, electronic and magnetic structures of a novel series of intergrowth carbometalates R₄Co₂C₃ (R = Y, Gd, Tb)