Navegação por Revista "AIP Advances"

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  • IPEN-DOC 24325

    DOMIENIKAN, C. ; BOSCH-SANTOS, B. ; CABRERA-PASCA, G.A.; SAXENA, R.N. ; CARBONARI, A.W. . Anomalous behavior of the magnetic hyperfine field at 140Ce impurities at La sites in LaMnSi2. AIP Advances, v. 8, n. 5, p. 055702-1 - 055702-6, 2018. DOI: 10.1063/1.5006897

    Abstract: Magnetic hyperfine field has been measured in the orthorhombic intermetallic compound LaMnSi2 with perturbed angular correlation (PAC) spectroscopy using radioactive 140La(140Ce) nuclear probes. Magnetization measurements were also carried out in this compound with MPSM-SQUID magnetometer. Samples of LaMnSi2 compound were prepared by arc melting the component metals with high purity under argon atmosphere followed by annealing at 1000°C for 60 h under helium atmosphere and quenching in water. X-ray analysis confirmed the samples to be in a single phase with correct crystal structure expected for LaMnSi2 compound. The radioactive 140La (T1/2 = 40 h) nuclei were produced by direct irradiation of the sample with neutrons in the IEA-R1 nuclear research reactor at IPEN with a flux of ∼ 1013 n cm−2s−1 for about 3 - 4 min. The PAC measurements were carried out with a six BaF2 detector spectrometer at several temperatures between 10 K and 400 K. Temperature dependence of the hyperfine field, Bhf was found to be anomalous. A modified two-state model explained this anomalous behavior where the effective magnetic hyperfine field at 140Ce is believed to have two contributions, one from the unstable localized spins at Ce impurities and another from the magnetic Mn atoms of the host. The competition of these two contributions explains the anomalous behavior observed for the temperature dependence of the magnetic hyperfine field at 140Ce. The ferromagnetic transition temperature (TC) of LaMnSi2 was determined to be 400(1) K confirming the magnetic measurements.

    Palavras-Chave: cerium 140; impurities; iear-1 reactor; magnetic fields; hyperfine structure; crystal field; intermetallic compounds

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  • IPEN-DOC 23154

    BOSCH-SANTOS, B. ; CABRERA-PASCA, G.A.; SAXENA, R.N. ; FREITAS, R.S.; CARBONARI, A.W. . Characterization of magnetic phase transitions in PrMn2Ge2 compound investigated by magnetization and hyperfine field measurements. AIP Advances, v. 7, n. 5, p. 056211-1 - 056211-6, 2017. DOI: 10.1063/1.4974025

    Abstract: The magnetic properties of PrMn2Ge2 compound have been investigated by perturbed γ−γγ−γ angular correlation (PAC) spectroscopy using 111In(111Cd) as probe nuclei as well as by magnetization measurements. This ternary intermetallic compound exhibits different magnetic structures depending on the temperature. The magnetic ordering is mainly associated with the magnetic moment of 3d-Mn sublattice but at low temperatures a magnetic contribution due to ordering of the magnetic moment from 4f-Pr sublattice appears. PAC results with 111Cd probe nuclei at Mn sites show that the temperature dependence of hyperfine field Bhf(T) follows the expected behavior for the host magnetization, which could be fitted by two Brillouin functions, one for antiferromagnetic phase and the other for ferromagnetic phase, associated with the magnetic ordering of Mn ions. Magnetization measurements showed the magnetic behavior due to Mn ions highlighting the antiferromagnetic to ferromagnetic transition around 326 K and an increase in the magnetization around 36 K, which is ascribed to Pr ions ordering.

    Palavras-Chave: intermetallic compounds; magnetic properties; phase transformations; perturbed angular correlation; hyperfine structure

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  • IPEN-DOC 27768

    MACIEL, L.S. ; BURIMOVA, A. ; PEREIRA, L.F.D. ; FERREIRA, W.L. ; SALES, T.S.N. ; GONÇALVES, V.C. ; CABRERA-PASCA, G.A.; SAXENA, R.N. ; CARBONARI, A.W. . DFT-based calculations of the magnetic hyperfine interactions at Cd sites in RCd (R = rare earth) compounds with the FP-LAPW ELK code. AIP Advances, v. 11, n. 2, p. 025010-1 - 025010-4, 2021. DOI: 10.1063/9.0000161

    Abstract: In the work here reported, we have calculated magnetic hyperfine interactions in rare-earth (R) intermetallic compounds by using the free open-source all-electron ELK code. The RCd (R = Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb) series was chosen as a test system because an almost complete set of experimental data on the hyperfine parameters at Cd sites was acquired through the time differential perturbed angular correlation (TDPAC) spectroscopy as previously reported. Moreover, results on magnetic hyperfine field (Bhf ) from WIEN2k code were also reported allowing a qualitative comparison analysis. We emphasize that the utilized version of ELK accounted for the contact field only. Yet, as it is the only contribution expected for Cd site in RCd compounds, the calculated Bhf values are in reasonable agreement with the experimental results. The Spin-orbit coupling when taken into account led to a decrease in deviation from experimental data. Addition, the Hubbard-like term was revealed crucial in order to make Bhf predictions for CeCd, suggesting that this behavior may be associated with a weaker 4f electron localization in Ce.

    Palavras-Chave: calculation methods; rare earths; hyperfine structure; cadmium compounds; computer codes; spectroscopy; theoretical data

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  • IPEN-DOC 26867

    CABRERA-PASCA, G.A.; BOSCH-SANTOS, B. ; BURIMOVA, A. ; CORREA, E.L. ; CARBONARI, A.W. . Effect of the magnetic impurity on the charge diffusion in highly dilute Ce doped LaMnO3. AIP Advances, v. 10, n. 1, p. 015223-1 - 015223-5, 2020. DOI: 10.1063/1.5130429

    Abstract: LaMnO3+δ is a complex oxide, which, depending on the oxygen excess concentration, presents different crystalline structure and interesting magnetic and electric properties such as colossal magnetoresistance, polaron dynamics, multiferroic behavior, and charge-orbital ordering. This complexity requires different characterization techniques to draw a picture as complete as possible allowing a good understanding of these phenomena. Here, we have used the perturbed angular correlation (PAC) technique to measure hyperfine interactions at La and Mn sites of LaMnO3+δ(δ ∼0.15) using 140Ce and 111Cd at La sites as probe nuclei in order to investigate within an atomic scale the magnetic and electric interactions in this compound. The results show that 111Cd nuclei occupy highly symmetric local sites in agreement with a rhombohedral structure. The magnetic hyperfine field (Bhf ) measured with 111Cd at La sites is very small (Bhf = 0.40 T) due to the supertransferred magnetic field from Mn neighbors through oxygen orbitals. On the other hand, 140Ce nuclei at La sites present a saturation field of around 3.7 T much higher than that expected for La sites (due to the weak transfer field by superexchange mechanism). In addition, for temperature range above the magnetic ordering (200-300 K) a dynamic hyperfine interaction was observed characterized by the attenuation parameter λ(T) whose temperature dependence allowed to determine the activation energy (Ea) associated to charge transfer. The polarization of the 4f -electron of Ce impurities affects the local magnetic field at impurity sites as well as the Ea.

    Palavras-Chave: impurities; magnetic flux; doped materials; perturbed angular correlation; trigonal lattices; hyperfine structure; magnetic moments; cerium additions; lanthanum; thin films; manganese oxides; probes

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  • IPEN-DOC 26868

    CORREA, E.L. ; BOSCH-SANTOS, B. ; SAXENA, R.N. ; CABRERA-PASCA, G.A.; CARBONARI, A.W. . Effects of an external magnetic field on the hyperfine parameters in RE2O3 (RE = Gd, Er) nanoparticles measured by perturbed angular correlation spectroscopy. AIP Advances, v. 10, n. 1, p. 015039-1 - 015039-6, 2020. DOI: 10.1063/1.5130401

    Abstract: In order to understand the interaction mechanisms in RE2O3 (RE=Gd, Er) nanoparticles (NPs), Perturbed Angular Correlation (PAC) spectroscopy, a local technique, plus external magnetic field, was used to elucidate local interactions and possible mapping of the different contribution in these compounds. NPs were synthesized by thermal decomposition and characterized by transmission electron microscopy and X-ray diffraction. PAC measurements were performed using 111In(111Cd) as probe nuclei, with and without the application of an external magnetic field (EMF) of 0.5 T in different temperatures (50 K, 100 K, 200 K, 300 K). Results show that the hyperfine magnetic field is almost zero when the probe is located at the symmetric site, and ∼4 T and ∼5 T for Gd2O3 and Er2O3, respectively, when the probe occupies the asymmetric field.

    Palavras-Chave: perturbed angular correlation; spectroscopy; magnetic fields; rare earths; hyperfine structure; asymmetry coefficients; thermal analysis; transmission electron microscopy; x-ray diffraction

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  • IPEN-DOC 23201

    SCHELL, JULIANA; LUPASCU, DORU C.; CARBONARI, ARTUR W. ; MANSANO, RONALDO D.; DANG, THIEN T.; VIANDEN, REINER. Implantation of cobalt in SnO2 thin films studied by TDPAC. AIP Advances, v. 7, n. 5, p. 055304-1 - 055304-6, 2017. DOI: 10.1063/1.4983270

    Abstract: Here we report time differential perturbed angular correlation (TDPAC) results of Co-doped SnO2 thin films. Making use of stable Co and radioactive 111In implanted at the Bonn Radioisotope Separator with energies of 80 keV and 160 keV, respectively, it was possible to study the dopant incorporation and its lattice location during annealing. The hyperfine parameters have been probed as a function of temperature in vacuum. Two quadrupole interactions were observed. At high temperatures the dominant fraction for the probe nuclei can be assigned to the Cd-incorporation at the cation substitutional site in a highly disordered structure, obtained after implantation, to high crystallinity for the measurements at 873 K and 923 K. The similarity in TDPAC spectra obtained in undoped SnO gives indirect evidence that In and Co diffuse to different depths during the annealing process. Other interpretations will be discussed.

    Palavras-Chave: thin films; tin oxides; cobalt; differential pac; angular correlation; perturbed angular correlation; spectra

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  • IPEN-DOC 27552

    CABRERA-PASCA, G.A.; MAGNO, J.F.; FERREIRA, W.L. ; CAMPOS, A.C. ; BOSCH-SANTOS, B. ; SALES, T.S.N. ; PEREIRA, L.F.D. ; BURIMOVA, A. ; SAXENA, R.N. ; FREITAS, R.S.; CARBONARI, A.W. . Local inspection of magnetic properties in GdMnIn by measuring hyperfine interactions. AIP Advances, v. 11, n. 1, p. 015322-1 - 015322-6, 2021. DOI: 10.1063/9.0000037

    Abstract: GdMnIn is reported to crystallize in the hexagonal MgNi2-type structure presenting a spin-glass behavior with no magnetic order attributed to the triangular spin frustration of magnetic ions. In the present work, FC-ZFC magnetization, specific heat and AC susceptibility measurements along with the local magnetic exchange measured by hyperfine interactions at In sites are used to investigate the magnetic behavior in GdMnIn compound. The ZFC-FC magnetization curves exhibit an inflection which was ascribed to the antiferromagnetic transition at TN= 145 K. These curves also give an indication of thermomagnetic irreversibility at 118 K, which along with the absence of inflection in specific heat results might be associated to spin-glass behavior. Results of AC susceptibility and magnetic hyperfine field measured using 111In(111Cd) probe nuclei carried out by perturbed angular correlations (PAC) technique did not show evidence of spin-glass behavior. The thermomagnetic irreversibility in FC-ZFC curves along with results of hyerfine interactions suggest the presence of magneto-crystalline anisotropy effects and a weak long-range coupling in GdMnIn.

    Palavras-Chave: magnetic properties; hyperfine structure; angular correlation; perturbed angular correlation; spin glass state; magnetization; gadolinium; manganese; indium

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  • IPEN-DOC 26466

    BOSCH-SANTOS, B. ; NASCIMENTO, N.M. ; SAIKI, M. ; CORREA, E.L. ; SALES, T.S.N. ; PEREIRA, L.F.D. ; CABRERA-PASCA, G.A.; SAXENA, R.N. ; SCHELL, J.; CARBONARI, A.W. . Magnetic field at Ce impurities in La sites of La0.5Ba0.5MnO3 double perovskites. AIP Advances, v. 9, n. 3, p. 035245-1 - 035245-5, 2019. DOI: 10.1063/1.5080094

    Abstract: Due to its rich variety of electromagnetic properties, such as a colossal magnetoresistance, charge and orbital ordering, and metal-insulator transition, the magnetic behavior in La0.5Ba0.5MnO3 double perovskite compounds has been investigated by several techniques, however more experimental data, especially from atomic resolution techniques, are still necessary to understand such complex behavior. In this paper, we have used a nuclear and short-range technique, the Perturbed Angular Correlation (PAC) spectroscopy, to investigate the magnetic hyperfine interaction at the 140Ce and 111Cd probe nuclei as impurities occupying La sites. This double perovskite samples were synthesized by Sol- Gel route. The crystal structure was determined by X-ray diffraction and the analyses showed that this method produced perovskite oxides with cubic structure in Pm-3m space group and the homogeneity was determined by Transmission Electron Microscopy (TEM). The local properties investigated by PAC spectroscopy revealed a ferromagnetic transition temperature above 300 K and a pure antiferromagnetic interaction below 100 K. Moreover, it also indicates an anomalous behavior of the temperature dependence of magnetic hyperfine field at La sites measured with 140Ce probe nuclei, which can be ascribed to the contribution of 4f band of Ce to Magnetic Hyperfine Field (Bhf) at low temperatures due to the increase in its localized character.

    Palavras-Chave: magnetic fields; spectroscopy; perturbed angular correlation; transmission electron microscopy; perovskite; cerium alloys; impurities; polycrystals; lanthanum

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  • IPEN-DOC 22373

    KRYLOV, V.I. ; BOSCH SANTOS, B.; CABRERA PASCA, G.A.; DELYAGIN, N.N.; CARBONARI, A.W. . Mapping the magnetic hyperfine field in GdCosub(5). AIP Advances, v. 6, p. 056024-1 - 056024-6, 2016.

    Palavras-Chave: mapping; hyperfine structure; gadolinium compounds; cobalt compounds; comparative evaluations; perturbed angular correlation; spectroscopy; heat; tin 119; cadmium 111

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  • IPEN-DOC 22374

    CORREA, E. L. ; BOSCH SANTOS, B. ; CAVALCANTE, F.H.M. ; CORREA, B.S.; FREITAS, R.S.; CARBONARI, A.W. ; POTIENS, M.P.A. . Properties of Gdsub(2)Osub(3) nanoparticles studied by hyperfine interactions and magnetization mesurements. AIP Advances, v. 6, p. 056112-1 - 056112-7, 2016.

    Palavras-Chave: gadolinium oxides; nanoparticles; magnetization; spectroscopy; indium 111; cadmium 111; x-ray diffraction; transmission electron microscopy

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  • IPEN-DOC 23107

    SALES, T.S.N. ; CAVALCANTE, F.H.M.; BOSCH-SANTOS, B. ; PEREIRA, L.F.D. ; CABRERA-PASCA, G.A.; FREITAS, R.S.; SAXENA, R.N. ; CARBONARI, A.W. . Stable tetragonal phase and magnetic properties of Fe-doped HfO2 nanoparticles. AIP Advances, v. 07, n. 05, p. 056315-1 - 056315-6, 2017. DOI: 10.1063/1.4976583

    Abstract: In this paper, the effect in structural and magnetic properties of iron doping with concentration of 20% in hafnium dioxide (HfO2) nanoparticles is investigated. HfO2 is a wide band gap oxide with great potential to be used as high-permittivity gate dielectrics, which can be improved by doping. Nanoparticle samples were prepared by sol-gel chemical method and had their structure, morphology, and magnetic properties, respectively, investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) with electron back scattering diffraction (EBSD), and magnetization measurements. TEM and SEM results show size distribution of particles in the range from 30 nm to 40 nm with small dispersion. Magnetization measurements show the blocking temperature at around 90 K with a strong paramagnetic contribution. XRD results show a major tetragonal phase (94%).

    Palavras-Chave: nanoparticles; doped materials; hafnium oxides; magnetic properties; iron oxides; phase stability; tetragonal lattices

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  • IPEN-DOC 28078

    MALDONADO, E.P.; SAMAD, R.E. ; BONATTO, A.; NUNES, R.P.; BANERJEE, S.; VIEIRA JUNIOR, N.D. . Study of quasimonoenergetic electron bunch generation in self-modulated laser wakefield acceleration using TW or sub-TW ultrashort laser pulses. AIP Advances, v. 11, n. 6, p. 065116-1 - 065116-10, 2021. DOI: 10.1063/5.0052831

    Abstract: This work presents a study on laser wakefield electron acceleration in the self-modulated regime (SM-LWFA) using 50-fs laser pulses with energy on the mJ scale, at λ = 0.8 μm, impinging on a thin H2 gas jet. Particle-in-cell simulations were performed using laser peak powers ranging from sub-terawatt to a few terawatts and plasma densities varying from the relativistic self-focusing threshold up to values close to the critical density. The differences in the obtained acceleration processes are discussed. Results show that bunched electron beams with full charge on the nC scale and kinetic energy in the MeV range can be produced and configurations with peak density in the range 0.5–5 × 1020 atoms/cm3 generate electrons with maximum energies. In this range, some simulations generated quasimonoenergetic bunches with ∼0.5% of the total accelerated charge and we show that the beam characteristics, process dynamics, and operational parameters are close to those expected for the blowout regime. The configurations that led to quasimonoenergetic bunches from the sub-TW SM-LWFA regime allow the use of laser systems with repetition rates in the kHz range, which can be beneficial for practical applications.

    Palavras-Chave: electron beams; laser radiation; pulses; modulation; tail electrons

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  • IPEN-DOC 27751

    SALES, T.S.N. ; BURIMOVA, A. ; RODRIGUES, P.S. ; MATOS, I.T. ; CABRERA-PASCA, G.A.; SAXENA, R.N. ; PEREIRA, L.F.D. ; OTUBO, L. ; CARBONARI, A.W. . Synthesis and characterization of Fe3O4-HfO2 nanoparticles by hyperfine interactions measurements. AIP Advances, v. 11, n. 1, p. 015047-1 - 015047-4, 2021. DOI: 10.1063/9.0000235

    Abstract: Nanoparticles (NPs) that combine biocompatibility and enhanced physical characteristics for biomedical applications are currently an area of intense scientific research. Hafnium oxide NPs are an innovative approach in the anticancer treatment by radiotherapy due to their low toxicity and enhancement of local dose in the tumor reducing the total radiation dose for the patient. The combination of this property with the excellent magnetic hyperthermia performance of Fe3O4 NPs can produce a promising nanomaterial for cancer therapy. In this work, we attempted to synthesize nanoscale samples of HfO2 doped with nominal 10 at.% Fe, and Fe3O4 doped with Hf at 10 at.% level using simple chemical routes. The crystal structure of the samples was characterized by X-ray diffraction. The material was irradiated with neutrons in a research reactor, the nuclear reaction 180Hf(n, γ)181Hf yielding the probe nucleus 181Hf(181Ta) used in the perturbed angular correlations experiments to measure hyperfine interactions. Despite their immediate response to the external magnetic field, at local level both samples showed only electric quadrupole interaction typical of the monoclinic hafnia indicating that Fe replaces Hf in HfO2 NPs, but, rather than substituting Fe, Hf enters magnetite in the form of HfO2 clusters. Transmission Electron Microscopy was exploited to study the morphology of these complex systems, as well as to localize hafnia clusters and understand the nature of their coupling to Fe3O4 specks.

    Palavras-Chave: nanoparticles; magnetite; transmission electron microscopy; hafnium oxides; radiotherapy; synthesis; composite materials

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O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.