A. R. S. Macêdo

ORCID: 0000-0003-0829-1474
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About
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Research Areas
  • Theoretical and Computational Physics
  • Material Dynamics and Properties
  • Physics of Superconductivity and Magnetism
  • Chemical Thermodynamics and Molecular Structure
  • Thermal and Kinetic Analysis
  • ZnO doping and properties
  • Nonlinear Optical Materials Research
  • Copper-based nanomaterials and applications
  • Quantum Dots Synthesis And Properties
  • Crystallography and molecular interactions
  • Advanced Mathematical Modeling in Engineering
  • Opinion Dynamics and Social Influence

Instituto Federal do Maranhão
2023

Universidade Federal do Maranhão
2023

Universidade Federal de Minas Gerais
2023

Universidade de São Paulo
2014

We report the controlled alloying, oxidation, and subsequent reduction of individual AgAu nanoparticles in scanning transmission electron microscope (STEM). Through sequential application beam induced oxidation situ heating quenching, we demonstrate transformation Ag-Au core-shell into: alloyed, Au-Ag core-shell, hollow Au-Ag2O yolk-shell nanoparticles. are able to directly image these morphological transformations real-time at atomic resolution perform energy dispersive X-ray (EDX) spectrum...

10.1039/c4nr04837g article EN cc-by Nanoscale 2014-01-01

Abstract We analyse the probability distribution functions of energy and magnetisation two-dimensional Blume–Capel (BC) Baxter–Wu (BW) models with spin values <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mi>S</mml:mi> <mml:mo>∈</mml:mo> <mml:mo fence="false" stretchy="false">{</mml:mo> <mml:mn>1</mml:mn> <mml:mo>/</mml:mo> </mml:mrow> <mml:mn>2</mml:mn> <mml:mo>,</mml:mo> <mml:mn>3</mml:mn> stretchy="false">}</mml:mo> </mml:math> in presence a...

10.1088/1742-5468/ad784e article EN Journal of Statistical Mechanics Theory and Experiment 2024-10-25

We investigate the critical behavior of two-dimensional spin-1 Baxter-Wu model in presence a crystal-field coupling $\mathrm{\ensuremath{\Delta}}$ with goal determining universality class transitions along second-order part transition line as one approaches putative location multicritical point. employ extensive Monte Carlo simulations using two different methodologies: (i) study zeros energy probability distribution, closely related to Fisher partition function, and (ii) well-established...

10.1103/physreve.108.024140 article EN cc-by Physical review. E 2023-08-25

We analyse the probability distribution functions of energy and magnetisation two-dimensional Blume-Capel Baxter-Wu models with spin values $S \in \{1/2,1, 3/2\}$ in presence a crystal field $\Delta$. By employing extensive single-spin flip Monte Carlo simulations recently developed method studying zeros we are able to probe, good numerical accuracy, several critical characteristics transitions. Additionally, universal aspects these transitions scrutinised by computing corresponding...

10.48550/arxiv.2407.05387 preprint EN arXiv (Cornell University) 2024-07-07

We investigate the critical behavior of two-dimensional spin-$1$ Baxter-Wu model in presence a crystal-field coupling $Δ$ with goal determining universality class transitions along second-order part transition line as one approaches putative location multicritical point. employ extensive Monte Carlo simulations using two different methodologies: (i) study zeros energy probability distribution, closely related to Fisher partition function, and (ii) well-established multicanonical approach...

10.48550/arxiv.2304.12379 preprint EN other-oa arXiv (Cornell University) 2023-01-01

This study focuses on the synthesis and characterization of novel Ni(II)(L-threoninato)2(H2O)2 crystal, a bivalent transition metal complex based Ni2+ ions, crystalline structure thermal properties. Through crystallographic analysis, we reveal that adopts an orthorhombic system with C2221 space group. To gain insights into its behavior, thermogravimetric differential scanning calorimetry techniques were employed to estimate kinetic parameters related degradation. Model-free employing...

10.2139/ssrn.4591776 preprint EN 2023-01-01
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