Growth and magnetic properties of bulk electron doped La0.7Ce0.3MnO3 manganites

Sergeenkov, S.; Cardoso, C. A.; Andreeta, Marcello Rubens Barsi; Hernandes, Antônio Carlos; Leite, E. R.; Moreira, Fernando M. Araujo

doi:10.1002/pssa.201127015

Cited by 7 publications

(6 citation statements)

References 25 publications

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“…The same temperature scale may well characterize doped manganite perovskites too. However, the question of magnetic secondary phases, raised for instance for La 0.7 Ce 0.3 MnO 3 and La 0.8 Hf 0.2 MnO 3 [48,49] and discussed in that case by reference to undetected MnO 2 , should not be underestimated.…”

Section: Resultsmentioning

confidence: 99%

Structural and Magnetic Properties of Nanosized Half-Doped Rare-Earth Ho0.5Ca0.5MnO3 Manganite

et al. 2022

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We investigated the structural and magnetic properties of 20 nm-sized nanoparticles of the half-doped manganite Ho0.5Ca0.5MnO3 prepared by sol-gel approach. Neutron powder diffraction patterns show Pbnm orthorhombic symmetry for 10 K < T < 290 K, with lattice parameters a, b, and c in the relationship c/√2 < a < b, indicating a cooperative Jahn–Teller effect, i.e., orbital ordering OO, from below room temperature. In contrast with the bulk samples, in the interval 250 < T < 300 K, the fingerprint of charge ordering (CO) does not manifest itself in the temperature dependence of lattice parameters. However, there are signs of CO in the temperature dependence of magnetization. Accordingly, below 100 K superlattice magnetic Bragg reflections arise, which are consistent with an antiferromagnetic phase strictly related to the bulk Mn ordering of a charge exchange-type (CE-type), but characterized by an increased fraction of ferromagnetic couplings between manganese species themselves. Our results show that in this narrow band half-doped manganite, size reduction only modifies the balance between the Anderson superexchange and Zener double exchange interactions, without destabilizing an overall very robust antiferromagnetic state.

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Section: Resultsmentioning

confidence: 99%

Structural and Magnetic Properties of Nanosized Half-Doped Rare-Earth Ho0.5Ca0.5MnO3 Manganite

et al. 2022

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“…Based on our previous zero-field resistance results, 29 it is reasonable to assume that in the low-temperature ferromagnetic (FM) region R(T, H) is dominated by a spin-polaron hopping scenario modified by applied magnetic field, leading to the following expression 29,[32][33][34][35]…”

Section: Resultsmentioning

confidence: 99%

Comparative study on magnetoresistance of carbon-cobalt nanocomposite thin films grown by pulsed laser deposition

Sergeenkov¹,

Córdova²,

Cichetto³

et al. 2018

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We present a comparative study on the influence of applied magnetic field on the resistance of C 1−x Co x thin films (with x = 0.1, 0.15 and 0.2) grown on Si substrate by pulsed laser deposition technique. It is found that the behavior of magnetoresistance (MR) drastically depends on the temperature. Namely, at low temperatures MR is positive and its behavior is governed by the field mediated weak localization scenario. While at high temperatures MR turns negative and its behavior is dominated by electron scattering on ferromagnetic cobalt atoms.

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“…Recall that according to the theory of Gaussian fluctuations, the fluctuations of any observable (such as heat capacity, magnetization, etc) which is conjugated to the order parameter η i , can be presented in terms of the statistical average of the fluctuation amplitude < (δη i ) 2 > with δη i = η i − η 0i . Namely, the fluctuation-induced contribution to magnetization above (+) and below (−) the critical point T i reads [11,13]…”

Section: Resultsmentioning

confidence: 99%

Deciphering M-T diagram of shape memory Heusler alloys: reentrance, plateau and beyond

Sergeenkov,

Cordova,

Ari-Gur

et al. 2017

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We present our recent results on temperature behavior of magnetization observed in N i47M n39In14 Heusler alloys. Three regions can be distinguished in the M −T diagram: (I) low temperature martensitic phase (with the Curie temperature TCM = 140K), (II) intermediate mixed phase (with the critical temperature TMS = 230K) exhibiting a reentrant like behavior (between TCM and TMS), and (III) high temperature austenitic phase (with the Curie temperature TCA = 320K) exhibiting a rather wide plateau region (between TMS and TCA). By arguing that powerful structural transformations, causing drastic modifications of the domain structure in alloys, would also trigger strong fluctuations of the order parameters throughout the entire M − T diagram, we were able to successfully fit all the data by incorporating Gaussian fluctuations (both above and below the above three critical temperatures) into the Ginzburg-Landau scenario.

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Growth and magnetic properties of bulk electron doped La_0.7Ce_0.3MnO₃ manganites

Cited by 7 publications

References 25 publications

Structural and Magnetic Properties of Nanosized Half-Doped Rare-Earth Ho0.5Ca0.5MnO3 Manganite

Structural and Magnetic Properties of Nanosized Half-Doped Rare-Earth Ho0.5Ca0.5MnO3 Manganite

Comparative study on magnetoresistance of carbon-cobalt nanocomposite thin films grown by pulsed laser deposition

Deciphering M-T diagram of shape memory Heusler alloys: reentrance, plateau and beyond

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