A5071164443- Rare-earth and actinide compounds
- Iron-based superconductors research
- Magnetic Properties of Alloys
- Physics of Superconductivity and Magnetism
- Boron and Carbon Nanomaterials Research
- Magnetic properties of thin films
- Superconductivity in MgB2 and Alloys
- Advanced Condensed Matter Physics
- Theoretical and Computational Physics
- Magnetic and transport properties of perovskites and related materials
- Spectroscopy and Quantum Chemical Studies
- Magnetic Properties and Applications
- Microstructure and Mechanical Properties of Steels
- High-pressure geophysics and materials
- Intermetallics and Advanced Alloy Properties
- Multiferroics and related materials
- Advanced Chemical Physics Studies
- Semiconductor materials and interfaces
- Advanced ceramic materials synthesis
- MXene and MAX Phase Materials
- Calcium Carbonate Crystallization and Inhibition
- Metallic Glasses and Amorphous Alloys
- Crystallography and Radiation Phenomena
- Magnetic and Electromagnetic Effects
- Membrane Separation Technologies
Universidade Federal do Rio de Janeiro
2013-2025
Centro Brasileiro de Pesquisas Físicas
1994-1996
National University of San Marcos
1994
Leiden University
1986-1991
University of Khartoum
1991
Rijksmuseum
1986-1989
Abstract The antiscale magnetic treatment (ASMT) claims to utilize field combat scaling. However, its underlying mechanism, effectiveness, and reliability remain controversial. To address these contentious aspects, we analyze the influence of a on different stages typical scale formation, using $${\text{CaCO}}_{3}$$ as model scale. For simplification, consider working fluid, such in domestic industrial settings, homogeneous mixture supersaturated, multi-ionic solution suspension neutral...
Based on extensive Mossbauer effect (ME) and magnetization measurements, the orthorhombic AlFe2B2 was characterized as a ferromagnet (FM) because this character is evident an onset of FM transition at Tc=320 K characteristic magnetizations isotherms below Tc. At liquid helium temperatures, saturates to μsat≈1μB per Fe atom; value which half one reported for iron metal indicating relatively more filled 3d band. The ME analysis revealed hyperfine field H(0) 88(2) kOe, isomer shift (relative...
The temperature- and field-dependent specific heat $C(T,H)$ measurement on the noncentrosymmetric superconductors ${\mathrm{Li}}_{2}{\mathrm{Pd}}_{3}\mathrm{B}$, ${\mathrm{Li}}_{2}{\mathrm{Pt}}_{3}\mathrm{B}$, ${\mathrm{Li}}_{2}{({\mathrm{Pd}}_{0.5}{\mathrm{Pt}}_{0.5})}_{3}\mathrm{B}$ were carried out over a wide range of $T$ $H$. limit compounds is found to be distinctly different: within superconducting phase, electronic Pd-based compound follows...
The transport and magnetic properties of the tetragonal Fe$_{1+\delta}$S were investigated using magnetoresistivity magnetization within 2$\leq T\leq $300 K, $H\leq$70 kOe $P\leq$ 3.0 GPa. In addition, room-temperature X-ray diffraction photoelectron spectroscopy also applied. contrast to previously reported nonmetallic character, is intrinsically metallic but due a presence weak localization such character not exhibited below room temperature. An applied pressure reduces strongly this...
${\mathrm{CeRu}}_{2}$${\mathrm{Ge}}_{2}$ is a ferromagnet with ${\mathit{T}}_{\mathit{c}}$=7.5 K and localized Ce magnetic moment of \ensuremath{\sim}2 ${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$, aligned along the c direction tetragonal ${\mathrm{ThCr}}_{2}$${\mathrm{Si}}_{2}$ type crystalline structure. ${\mathrm{CeFe}}_{2}$${\mathrm{Ge}}_{2}$ nonmagnetic moderate heavy fermion system (\ensuremath{\gamma}=210 mJ/mol ${\mathrm{K}}^{2}$). In present work we have monitored change physical...
The austenite–ferrite superduplex stainless steel (SDSS) is essentially an Fe–Cr–Ni alloy to which additional elements (e.g. Mo, Mn, Si, Cu, C, P, S) were added so as confer advantageous characteristics such higher mechanical strength and resistance corrosion. Many of its applications require the process rolling which, due two-phase character, induces a marked texturing, elongation grains, directional ordering in each constituent phases. This, turn, imprints strong anisotropic features...
Neutron diffraction and thermodynamic techniques were used to probe the evolution of magnetic properties Tb(Co${}_{x}$Ni${}_{1\ensuremath{-}x}$)${}_{2}$B${}_{2}$C. A succession modes was observed as $x$ is varied: longitudinal modulated $\stackrel{P\vec}{k}=(0.55,0,0)$ state at $x=0$ transformed into a collinear $\stackrel{P\vec}{k}=(1/2,0,1/2)$ antiferromagnetic $x=$ 0.2, 0.4 then transverse $c$-axis $\stackrel{P\vec}{k}=(0,0,1/3)$ mode 0.6, finally simple ferromagnetic structure 0.8 1....
Based on magnetization, specific heat, magnetostriction and neutron-diffraction studies single-crystal TbCo2B2C, it is found out that the paramagnetic properties, down to liquid nitrogen temperatures, are well described by a Curie–Weiss behavior of Tb3+ moments. Furthermore, below Tc = 6.3 K, Tb sublattice undergoes ferromagnetic (FM) phase transition with easy axis being along (100) direction and, concomitantly, unit cell tetragonal-to-orthorhombic distortion. The manifestation an FM state...
The low-temperature properties of single-crystal CeCoGe were investigated by specific heat C(T,H), magnetoresistivity ρ(T,H), and differential susceptibility measurements χ(T,H). zero-field evolves as C = γT+βT(3) 42T+23.5T(3) mJ mol(-1) K(-1). On comparing its γ 42 K(-1) with that LaCoGe (12 K(-2)) it is inferred both 3d (Co) 4f (Ce) orbitals contribute to the density states at Fermi level. Assuming phonic contribution similar (β 0.5 K(-4)), then extra cubic term in (23T(3) K(-1)) must be...
We investigated the magnetoelastic and magnetic properties of single-crystal $\mathrm{Tb}{\mathrm{Ni}}_{2}{\mathrm{B}}_{2}\mathrm{C}$ within paramagnetic ordered phases along both $a$ $c$ axes. The measured gamma-parastriction susceptibilities are satisfactorily reproduced by theoretical calculations based on crystalline electric field molecular approximations. features $\ensuremath{\gamma}$-symmetry lowering mode indicate a noticeable orthorhombic distortion magnetically regions....
The magnetic structures of the title compounds have been studied by neutron diffraction. In contrast to isomorphous RNi2B2C wherein a variety exotic incommensurate modulated has observed, structure ErCo2B2C is found be collinear antiferromagnet with k=((1/2),0,(1/2)) while that HoCo2B2C and DyCo2B2C are observed simple ferromagnets. For all compounds, moments confined within basal plane their magnitudes in good agreement values obtained from low-temperature isothermal magnetization...
The magnetic properties of polycrystalline Tb(CoxNi1−x)2B2C (x=0.2,0.4,0.6,0.8) samples were probed by magnetization, specific heat, ac susceptibility, and resistivity techniques. For x≠0.4, the curves obtained are consistent with features expected for corresponding modes, namely k1=(0.55,0,0) at x=0; k2=(12,0,12) x=0.2 0.4; k3=(0,0,13) x=0.6, k4=(0,0,0) x=0.8 1. each these compositions, we thoroughly discuss analyses leading to determination critical temperature through separate independent...
Detailed analysis reveals that an incorporation of stabilized defect complexes within metallic thin films, though a highly disordering and nonequilibrium process, gives rise to superconductivity, Fermi-liquid (FL) transport, universal correlation among them. This remarkable manifestation correlated macroscopic quantum effects is attributed phonon-mediated electron-electron, e-e, scattering channel which encompasses both Koshino-Taylor Bergmann's pseudo-Umklapp processes. channel---denoted...
According to an earlier Abrikosov model, a positive, nonsaturating, linear magnetoresistivity (LMR) is expected in clean, low-carrier-density metals when measured at very low temperatures and under high magnetic fields. Recently, vast class of materials were shown exhibit extraordinary LMR but conditions that deviate sharply from the above-mentioned Abrikosov-type conditions. Such deviations are often considered within either classical Parish-Littlewood scenario random-conductivity network...
We observed superconductivity (Tc ≃2-3 K) in LixRhBy intermetallics wherein x and y vary over a wide compositional range.The crystal structure consists of cubic unit-cell (a ≃ 12.1 Å) with centrosymmetric space group P n 3n.A weak but positive pressure-induced increase Tc was observed.The correlations between the composition each followings were followed range y: dimensions, Tc, Sommerfeld coefficient γ, Debye temperature θD, critical fields H c1 c2. The thermal evolution electronic specific...