A5034529938- Rare-earth and actinide compounds
- Iron-based superconductors research
- Physics of Superconductivity and Magnetism
- Magnetic Properties of Alloys
- Inorganic Chemistry and Materials
- Topological Materials and Phenomena
- 2D Materials and Applications
- Advanced Condensed Matter Physics
- Magnetic properties of thin films
- Heusler alloys: electronic and magnetic properties
- Magnetic and transport properties of perovskites and related materials
- Intellectual Capital and Performance Analysis
- Cardiac, Anesthesia and Surgical Outcomes
- Inorganic Fluorides and Related Compounds
- Vascular anomalies and interventions
- Cold Atom Physics and Bose-Einstein Condensates
- Superconductivity in MgB2 and Alloys
- Zeolite Catalysis and Synthesis
- Advanced Semiconductor Detectors and Materials
- Ammonia Synthesis and Nitrogen Reduction
- Corporate Taxation and Avoidance
- Colorectal Cancer Surgical Treatments
Universidade Estadual de Campinas (UNICAMP)
2018-2024
Hospital de Clínicas da Unicamp
2024
Los Alamos National Laboratory
2022-2024
O abdome agudo obstrutivo é uma condição clínica caracterizada por obstrução intestinal, que pode resultar de diversas etiologias, incluindo aderências, hérnias, neoplasias e doenças inflamatórias. A apresentação inclui dor abdominal, distensão vômitos ausência evacuação ou flatulência. avaliação rápida adequada crucial para determinar a gravidade da necessidade intervenção cirúrgica. abordagem inicial envolve história detalhada exame físico, seguidos exames complementares, como radiografias...
Abstract In this work, we unveil the potential of nitrogen (N 2 ) adsorption from Liquid Argon (LAr) through molecular sieves (zeolites) Li-FAU Adsorbents. We report detailed studies about N gas at T = 89 K using a commercial Micromeritics ASAP-2420 equipment and purification LAr Purification Cryostat (PuLArC) IFGW/Unicamp. argue that by is possible thanks to stronger interaction with lithium cations present in zeolite Li-FAU. fact, experiments performed PuLArC have unequivocally shown...
The polarization dependence of the near edge x-ray absorption spectroscopy (XANES) is an element specific probe to real-space distribution density unoccupied states in solid-state materials. In this paper, we present Fe and As $K$-edge experiments $\mathrm{Ba}{({\mathrm{Fe}}_{1\ensuremath{-}x}{M}_{x})}_{2}{\mathrm{As}}_{2}$ ($M=\mathrm{Mn}$, Co, $x=0.0$ 0.08). reveal a strong probed XANES spectra, which concerns mainly increase intensity electronic transitions when beam set out sample's $ab$...
We report the electronic and magnetic properties of stoichiometric CeAuBi$_{2}$ single crystals. At ambient pressure, orders antiferromagnetically below a N\'{e}el temperature ($T_{N}$) 19 K. Neutron diffraction experiments revealed an antiferromagnetic propagation vector $\hat{\tau} = [0, 0, 1/2]$, which doubles paramagnetic unit cell along $c$-axis. low temperatures several metamagnetic transitions are induced by application fields parallel to $c$-axis, suggesting that structure changes as...
We have performed X-ray powder diffraction, magnetization, electrical resistivity, heat capacity and inelastic neutron scattering (INS) to investigate the physical properties of intermetallic series compounds CeCuBi$_{2-x}$Sb$_{x}$. These crystallize in a tetragonal structure with space group $P4/nmm$ present antiferromagnetic transition temperatures ranging from 3.6 K 16 K. Remarkably, magnetization easy axis changes along series, which is closely related variations crystalline electric...
Chemical substitution is commonly used to explore new ground states in materials, yet the role of disorder often overlooked. In Mn-substituted ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$ (MnBFA), superconductivity (SC) absent, despite being observed for nominal hole-doped phases. Instead, a glassy magnetic phase emerges, associated with $S=5/2$ Mn local spins. this work, we present comprehensive investigation electronic structure MnBFA using angle-resolved photoemission spectroscopy (ARPES). We...
We explore the effect of Ga substitution on physical properties single crystals ${\mathrm{Ce}}_{2}{\mathrm{RhIn}}_{8}$ through measurements temperature-dependent specific heat, magnetic susceptibility, and electrical resistivity. Our data ${\mathrm{Ce}}_{2}{\mathrm{RhIn}}_{8\ensuremath{-}x}{\mathrm{Ga}}_{x}$, reveal a monotonic decrease antiferromagnetic transition temperature from ${T}_{N}=2.77$ K for parent compound to ${T}_{N}$ = 1.96 highest concentration achieved ($x=0.55$). To...
For a significant composition range, the suppression of spin density wave transition temperature ( T_{\text{SDW}} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>T</mml:mi><mml:mtext mathvariant="normal">SDW</mml:mtext></mml:msub></mml:math> ) in Cr- and Mn-substituted BaFe _{2} display="inline"><mml:msub><mml:mi/><mml:mn>2</mml:mn></mml:msub></mml:math> As (CrBFA MnBFA, respectively) coincides as function Cr/Mn content, despite distinct electronic...
Abstract In this work, we investigated the role of different parameters in synthesis intermetallic nanowires CeIn 3 by metallic-flux nanonucleation (MFNN) method such as template pore diameter, crystallization temperature, heat treatment and time. Depending on growing parameters, obtained (d ∼ 350 nm) or CeAlO nanotubes. For nanowires, observed a suppression antiferromagnetic transition from bulk T N 10 K to nanowire system K, which may be associated with dimensionality affecting interplay...
We report the evolution of magnetic properties Ce2Rh1-xIrxIn8-yCdy single crystals. In particular, for Ce2Rh0.5Ir0.5In8 (TN=2.0K) and Ce2Rh0.5Ir0.5In7.79Cd0.21 (TN=4.2K), we have solved structure these compounds using single-crystal neutron diffraction experiments. Taking Ce2RhIn8 heavy-fermion antiferromagnet as a reference, identified no changes in q=12,12,0 wave vector; however, direction ordered Ce3+ moments rotates toward ab plane, under influence both dopants. By constraining analysis...
The gap-opening mechanism of a topological insulator, the quantum anomalous Hall effect, and axion physics are still pressing open questions, microscopic viewpoint to further understand role magnetism in topology is highly desirable. In this work we have performed investigation, by means electron spin resonance (ESR) along with complementary bulk measurements, on chalcogenide ${({\mathrm{Bi}}_{1\ensuremath{-}x}{\mathrm{Gd}}_{x})}_{2}{\mathrm{Se}}_{3}$ ($x=0$, 0.001, 0.002 0.006). Our...
Chemical substitution is commonly used to explore new ground states in materials, yet the role of disorder often overlooked. In Mn-substituted BaFe$_{2}$As$_{2}$ (MnBFA), superconductivity (SC) absent, despite being observed for nominal hole-doped phases. Instead, a glassy magnetic phase emerges, associated with $S=5/2$ Mn local spins. this work, we present comprehensive investigation electronic structure MnBFA using angle-resolved photoemission spectroscopy (ARPES). We find that causes...
The absence of superconductivity (SC) in Cr-substituted BaFe$_{2}$As$_{2}$ (CrBFA) is a well-established but poorly understood topic. It also established that the suppression spin density wave transition temperature ($T_{\text{SDW}}$) CrBFA and Mn-substituted (MnBFA) almost coincides as function Cr/Mn concentrations, irrespective putative distinct electronic effects these substitutions. In this work, we employ angle-resolved photoemission spectroscopy (ARPES) combined functional theory plus...
In this work, we performed systematic Nuclear Magnetic Resonance (NMR) and magnetic susceptibility experiments in CeCuSb _2 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi /><mml:mn>2</mml:mn></mml:msub></mml:math> single-crystals. The main findings were compared to previous report for CeCuBi . NMR spectra transferred hyperfine coupling the ^{63} display="inline"><mml:msup><mml:mi /><mml:mn>63</mml:mn></mml:msup></mml:math> Cu nuclei obtained...
Previous results in the family of heavy-fermion intermetallics RTBi2 (R = Ce, Pr, Nd, Sm, Gd; T Cu, Au) and CeCd0,7Sb2 compounds show that crystalline electrical field (CEF) effects play a crucial role strong competition between ferromagnetic (FM) antiferromagnetic (AFM) interactions. Moreover, magnetic phases these appear to be highly influenced by dimensionality system. These Ce-based display localized Ce3+ ions, which have one electron their ground state (2F5/2). The localization Ce 4f...
The gap opening mechanism of a topological insulator, the quantum anomalous Hall effect and axion physics are still pressing open questions microscopic viewpoint to further understand role magnetism in topology is highly desirable. In this work we have performed investigation, by means electron spin resonance (ESR) along with complementary bulk measurements, on chalcogenide (Bi$_{1-x}$Gd$_{x}$)$_{2}$Se$_{3}$ ($x$ = 0, 0.001, 0.002 0.006). Our analysis Gd$^{3+}$ dynamics reveal no significant...