A5022304718- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Magnetism in coordination complexes
- Rare-earth and actinide compounds
- Shape Memory Alloy Transformations
- Advanced Thermodynamics and Statistical Mechanics
- X-ray Diffraction in Crystallography
- Theoretical and Computational Physics
- Crystallization and Solubility Studies
- Magnetic Properties of Alloys
- Graphene research and applications
- Statistical Mechanics and Entropy
- Magnetic properties of thin films
- Complex Systems and Time Series Analysis
- Quantum and electron transport phenomena
- Heusler alloys: electronic and magnetic properties
- Quantum Information and Cryptography
- Crystal Structures and Properties
- Multiferroics and related materials
- Metal-Organic Frameworks: Synthesis and Applications
- Thermal Expansion and Ionic Conductivity
- Thermal properties of materials
- Advanced Thermoelectric Materials and Devices
- Organic and Molecular Conductors Research
- Electronic and Structural Properties of Oxides
Universidade Federal Fluminense
2015-2024
Universidad de Sevilla
2022-2024
Hospital Municipal Souza Aguiar
2023
University of Aveiro
2004-2019
Universidade do Estado do Rio de Janeiro
2014
Oak Ridge National Laboratory
2013
University of Minho
2008
Centro Brasileiro de Pesquisas Físicas
2000-2007
Full Heusler alloys display a wide range of physical phenomena with potential applications in different areas. However, researchers still struggle to overcome many limiting factors optimize their functional properties. Particularly, the poor mechanical properties X2YZ series undermine its exploration as shape memory and solid-state cooling materials. Recently, suppression p–d covalent hybridization characteristic these came up promising approach, resulting novel compounds displaying enhanced...
The study of advanced quantum devices for energy storage has attracted the attention scientific community in past few years. Although several theoretical progresses have been achieved recently, experimental proposals platforms operating as batteries under ambient conditions are still lacking. In this context, work presents a feasible realization battery carboxylate-based metal complex, which can store finite amount extractable form discord at room temperature, and recharge by thermalization...
The inverse magnetocaloric effect occurs when a magnetic material cools down under applied field in an adiabatic process. Although the existence of was recently reported experimentally, theoretical microscopic description is almost nonexistent. In this paper we theoretically describe antiferro- and ferrimagnetic systems. effects were systematically investigated as function model parameters. influence Néel compensation temperature on also analyzed using model.
The present work reports an experimental observation of thermal entanglement in a clusterized spin chain formed the compound ${\mathrm{Na}}_{2}{\mathrm{Cu}}_{5}{\mathrm{Si}}_{4}{\mathrm{O}}_{14}$. presence was investigated through two measured quantities, witness and formation, both derived from magnetic susceptibility. It found that pairwise exists below $\ensuremath{\sim}200\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Tripartite also observed...
In the present work we analyze magnetic entropy change $\ensuremath{\Delta}{S}_{\mathrm{M}}$ of ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ manganites, for a wide range Ca concentrations $(0.20\ensuremath{\leqslant}x\ensuremath{\leqslant}0.95)$. The results samples with $0.20<x\ensuremath{\leqslant}0.30$ usual behavior expected ferromagnetic systems, peaking at Curie temperature ${T}_{\mathrm{C}}$. contrast, charge-ordered antiferromagnetic $(0.30<x<0.90)$,...
Manganese monophosphate MnP single crystal deserves attention due to its rich magnetic phase diagram, which is quite different depending on the direction of applied field. Generally speaking, it has a Curie temperature around $291\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and several other arrangements at low temperatures (cone-, screw-, fan-, ferromagnetic-type structures). This richness strong magnetocrystalline anisotropy. In this sense, present paper makes thorough description influence...
Abstract There is a growing interest in understanding how size‐dependent quantum confinement affects the photoluminescence efficiency, excited‐state dynamics, energy‐transfer and thermalization phenomena nanophosphors. For lanthanide (Ln 3+ )‐doped nanocrystals, despite localized 4f states, effects are induced mostly via electron–phonon interactions. In particular, anomalous reported so far for handful of Ln ‐doped nanocrystals has been rationalized by absence low‐frequency phonon modes....
Magnetic oxides are promising materials for alternative health diagnoses and treatments. The aim of this work is to understand the dependence heating power with nanoparticle (NP) mean size, manganite composition La
Low-dimensional metal complexes are versatile materials with tunable physical and chemical properties that make these systems promising platforms for caloric applications. In this context, work proposes a quantum Stirling cycle based on dinuclear complex as working substance. The results show the operational modes can be managed when considering change in magnetic coupling of material temperature reservoirs. Moreover, susceptibility used to characterize heat exchanges each step and,...
In the present work we show that a particular family of materials, metal carboxylates, may have entangled states up to very high temperatures. From magnetic-susceptibility measurements, estimated critical temperature below which entanglement exists in copper carboxylate ${{\text{Cu}}_{2}{({\text{O}}_{2}\text{CH})}_{4}}{\text{Cu}{({\text{O}}_{2}\text{CH})}_{2}{(2\text{-methylpyridine})}_{2}}$, and found this be above room $({T}_{e}\ensuremath{\sim}630\text{ }\text{K})$. Furthermore, results...
This Letter presents the oscillatory behavior found in magnetic entropy change of diamagnetic materials. We show that this quantity depends on oscillating term and, as a consequence, magnetocaloric potential can be tuned either inverse or normal, depending value field change. A quite small (≈10−3 T) is able to invert These results open doors for applications at low temperatures and further developed incorporated into adiabatic demagnetization refrigerators, well sensible sensors.
The magnetocaloric effect of non-relativistic diamagnetic materials presents an oscillatory character due to the crossing Landau levels with Fermi energy. This occurs at low temperature (ca 1 K) and high magnetic field 10 T). Considering relativistic properties graphenes, a 2D massless material, these oscillations could be preserved in much higher 100 K), huge velocity (106 m/s). In addition, can tuned as either inverse or normal, by changing change ca 3.4 T.
The present Letter explores the electrocaloric effect of graphene nano-ribbons, with a longitudinal electric field and transversal magnetic field. Special features can be ruled tuned by applied fields as, for instance, unusual inverse effect, created Landau levels. These results open doors to enhance utility materials.
Abstract Quantum thermodynamics aims to explore quantum features enhance energy conversion beyond classical limits. While significant progress has been made, the understanding of caloric potentials in systems remains incomplete. In this context, study focuses on deriving general expressions for these potentials, by developing a Maxwell relationship obtained from thermal average form Ehrenfest theorem. Our results recover cases and also reveal that isothermal entropy change can be related...
Quantum teleportation, which depends on entangled states, is a fascinating subject and an important branch of quantum information processing. The present work reports the use dipolar spin thermal system as noisy channel to perform teleportation. Non-locality, tested by violation Bell's inequality entanglement, measured negativity, shows that for model all even those do not violate inequality, are useful
Abstract The coupling between electric, magnetic and elastic features in multiferroic materials is an emerging field science, with important applications on alternative solid-state cooling technologies, energy harvesting sensors/actuators. In this direction, we developed a thorough investigation of composite, comprising magnetocaloric/magnetostrictive Gd $${}_{5}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mrow/> <mml:mrow> <mml:mn>5</mml:mn> </mml:mrow>...