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Wyświetlanie 1-15 z 4586
Tytuł:
Influence of Transition and Rare Earth Elements on Magnetic Properties of Fe-Nb-B-M (M~=~Ni, Ag, Gd,~Tb) Bulk Nanocrystalline Alloys
Autorzy:
Ziółkowski, G.
Randrianantoandro, N.
Chrobak, A.
Klimontko, J.
Kądziołka-Gaweł, M.
Haneczok, G.
Powiązania:
https://bibliotekanauki.pl/articles/1428970.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
75.50.Tt
75.60.-d
76.80.+y
Opis:
In this work we present magnetic properties of the $(Fe_{80}Nb_6B_{14})_{1-x}M_x$ (where M = Ni, Ag, Gd, Tb and x = 0.08, 0.16, 0.32) bulk nanocrystalline alloys prepared by making use of mould casting technique. The applied preparation technique is favorable to nanocrystallization of the alloys with mean diameters of crystallites ranged from about 10 nm to 30 nm. Phase identification reveals a formation of ternary $RE_2Fe_{14}B$ and binary $REFe_2$ phases dependently on the alloy composition. It was found that for the alloys with Ag addition magnetic moment of Fe atom increases from 2.26 $μ_{B}$ to 3.36 $μ_{B}$ for x = 0.08 and x = 0.32, respectively. For Ni addition this quantity decreases with increasing x due to appearing of Fe-Ni (fcc) phases. For Gd, Tb additions the alloys are ferrimagnetic with compensation composition ranged between x = 0.08 and x = 0.16. The both rare earth alloying additions cause a significant magnetic hardening especially in the case of Tb.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1266-1269
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomalous Transport and Thermal Properties of the Solid Solutions U$\text{}_{1-x}$Th$\text{}_{x}$Cu$\text{}_{5}$M (M = Al, Ga, In and Sn)
Autorzy:
Troć, R.
Tran, V. H.
Kaczorowski, D.
Czopnik, A.
Powiązania:
https://bibliotekanauki.pl/articles/2011211.pdf
Data publikacji:
2000-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Mb
72.15.Qm
75.20.Hr
Opis:
UCu$\text{}_{5}$M-type compounds are moderate heavy fermion systems with an antiferromagnetic order below T$\text{}_{N}$ = 18, 16-25, and 25 K for M = Al, (Ga, In), and In, respectively, and a ferrimagnetic order with T$\text{}_{C}$ = 54 K for M = Sn. We present the results of magnetoresistance measurements as a function of temperature and applied magnetic field for the pure compounds and for their solid solutions containing Th, i.e. U$\text{}_{1-x}$Th$\text{}_{x}$Cu$\text{}_{5}$M. Only in the case of UCu$\text{}_{5}$In a substantial positive contribution to the magnetoresistance was observed at low temperatures, as for normal antiferromagnets. For the Al- and Sn-based alloys the magnetoresistance at low temperatures is negative, and its field variation proves the existence of Kondo-type interactions. On Th-substitution the magnetic phase transition is shifted to lower temperature and simultaneously the magnetoresistance becomes less negative. The field dependence of the magnetoresistance of these alloys can be well described by the Coqblin-Schrieffer model. Interestingly, the heat capacity measurements have revealed a general tendency to increase the linear coefficient γ with magnetic dilution of a given UCu$\text{}_{5}$M compound by Th-substitution. This feature reflects an enlargement of the effective mass of conduction electrons with the increase in both the unit cell volume and magnetic dilution. Such a tendency is also observed for the system UCu$\text{}_{5}$(In$\text{}_{1-x}$Ga$\text{}_{x}$), though the unit cell is here suppressed with increasing x. Thus, a similar physical picture is reached in all these systems but involving probably different mechanisms.
Źródło:
Acta Physica Polonica A; 2000, 97, 1; 25-35
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Novel Theoretical Study of Elastic and Electronic Properties of M₂CdC (M = Zr, Hf, and Ta) MAX Phases
Autorzy:
Mebrek, M.
Mokaddem, A.
Doumi, B.
Yakoubi, A.
Mir, A.
Powiązania:
https://bibliotekanauki.pl/articles/1030613.pdf
Data publikacji:
2018-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
MAX phases
ab initio
structural properties
electronic properties
elastic properties
crystal structure
Opis:
In this study, we have investigated the structural, electronic, and elastic properties of the M₂CdC (M = Ta, Zr, and Hf) MAX phases, using the first-principle methods based on the density functional theory. The calculated formation energies revealed that these compounds are thermodynamically stable in the hexagonal MAX phase. The stability is confirmed by the elastic constants and the conditions of mechanical stability criterion. Also, we have determined the bulk and shear modules of the Young modulus and the Poisson coefficient. The band structures indicate that the three materials are electrically conductive. The chemical bond in M₂CdC is covalent-ionic in nature with the presence of metallic character. For the density of states the hybridization peak between M d and C p occurs in the lower energy range. We have found that there is no gap for these materials due to the existence of a maximum peak of DOS around Fermi level.
Źródło:
Acta Physica Polonica A; 2018, 133, 1; 76-81
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropy of the Diamagnetic Susceptibility in 3,5-dibromo-p-amino and 3,5-dibromo-p-hydroxybenzoic Acids
Autorzy:
Abdel-Kader, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/1920927.pdf
Data publikacji:
1992-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
35.20.My
Opis:
The mean molar susceptibility (χ$\text{}_{M}$) for the two compounds 3,5-dibromo-p-aminobenzoic acid, Br$\text{}_{2}$C$\text{}_{6}$H$\text{}_{2}$(p-NH$\text{}_{2}$)COOH, and 3,5-dibromo-p-hydroxybenzoic acid, Br$\text{}_{2}$C$\text{}_{6}$H$\text{}_{2}$(p-OH)COOH, has been determined. The principal molecular susceptibilities K$\text{}^{∥}$ and K$\text{}^{⊥}$ have been evaluated. The magnetic anisotropy of each of the two compounds was obtained. From the atonic coordinates, as given by the X-ray structure analysis of Br$\text{}_{2}$C$\text{}_{6}$H$\text{}_{2}$(p-NH$\text{}_{2}$)COOH, the crystal susceptibilities (χ$\text{}_{a}$, χ$\text{}_{b}$, and χ$\text{}_{c}$) have been calculated. The magnetic properties are interpreted in the light of the crystal structure.
Źródło:
Acta Physica Polonica A; 1992, 82, 3; 407-411
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlations in Hexagonal Lattice Systems - Application to Carbon Nanotubes
Autorzy:
Czajka, K.
Maśka, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/2041458.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.22.-f
71.15.Dx
Opis:
We present exact diagonalization studies of two-dimensional electron gas on hexagonal lattice. Using Lanczös method we analyze the influence of the Coulomb correlations on the density of states and spectral functions. Choosing appropriate boundary conditions we simulate the geometry of a single wall carbon nanotube. In particular, integration over the boundary condition in one direction and summation in the other one allows us to perform cluster calculations for a tube-like system with a finite diameter and infinite length.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 703-707
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Next-Nearest-Neighbor Hopping in the Falicov-Kimball Model
Autorzy:
Czajka, K.
Maśka, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/2046727.pdf
Data publikacji:
2006-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.-w
71.10.Fd
Opis:
Results of Monte Carlo simulations for the spinless Falicov-Kimball model with the next-nearest-neighbor hopping are presented. We find the critical value of the next-nearest-neighbor hopping integral, below which the low temperature configuration of the localized particles is the same as in the presence of only the nearest-neighbor hopping. Beyond this critical value the localized particles form horizontal or vertical stripes.
Źródło:
Acta Physica Polonica A; 2006, 109, 4-5; 465-469
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Beam Propagation in Nematic Liquid Crystals
Autorzy:
Strinic, A. I.
Belic, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/2047844.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Tg
42.65.Sf
42.70.Df
Opis:
We investigate the behavior of beams propagating in nematic liquid crystals. A spatiotemporal model for the beam propagation and the director reorientation in a nematic liquid crystal is treated numerically in three spatial dimensions and time. We demonstrate the formation of stable solitons in a narrow threshold region of beam intensities for a set of fixed parameters and display soliton breathing. Below the threshold region the beams diffract, above the region spatiotemporal instabilities are observed, as the input intensity and the optical and static permittivity anisotropies of the liquid crystal molecules are increased. We demonstrate the filamentation of solitons above the threshold with increasing input intensity.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 877-883
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Direct Ellipsometry Problem for the Substrate-Based Uniaxial Non-Homogeneous Film
Autorzy:
Karpuk, M. M.
Karpuk, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/2029257.pdf
Data publikacji:
2001-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.-e
44.30.+v
Opis:
An iterative procedure of calculation of reflectivities and transmission coefficients of light rays for an uniaxial film with a lapse rate of an index of refraction on a uniaxial substrate was gained by orienting the axis of anisotropy along the normal to the boundary. With its help the dependences of ellipsometric angles Δ and ψ for a linear, quadratic, and sine-shaped profiles of refractive indices of a uniaxial immersing film with optic axis oriented along the normal to the boundary were analyzed. The dependences of angles Δ andψ on quantity of an uptake and anisotropy of the film were also examined. The numerical modelling for ZnO films and Langmuir-Blodgett-like films on a melted quartz was carried out, and this allowed to draw conclusions of practical importance for the ellipsometric investigations of the film structures.
Źródło:
Acta Physica Polonica A; 2001, 100, 6; 859-869
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lattice Dynamics of Noble Metals on Effective Three-Body Interaction
Autorzy:
Coelho, A. A.
Shukla, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/1945409.pdf
Data publikacji:
1996-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.-e
65.40.-f
Opis:
Quite recently we modified the original model of Sarkar et al. for cubic metals in extending the ion-ion interaction, ion-electron interaction and the introduction of crystal equilibrium condition. We applied our scheme to alkali metals. We studied here the lattice dynamics of noble metals on our approach by calculating phonon dispersion relations along the three principal symmetry directions, [ξ00], [ξξ0] and [ξξξ] and the (θ-T) curves of three noble metals: copper, silver and gold. We obtained reasonable agreement with the experimental findings.
Źródło:
Acta Physica Polonica A; 1996, 89, 5-6; 615-623
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lattice Dynamics of Alkali Metals in a Three-Body Interaction
Autorzy:
Coelho, A. A.
Shukla, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/1932113.pdf
Data publikacji:
1995-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
65.40.-f
63.20.-e
Opis:
The original model of Das et al. is modified in extending the electron-ion interaction on a three-body forces and including the crystal equilibrium condition to reduce one independent parameter. We studied the phonon dispersion relations along the three principal symmetry directions i.e. [ξ,0,0], [ξ,ξ,0] and [ξ,ξ,ξ] and θ-T curves of alkali metals, Na, K, Rb, Cs and Li. There is close agreement between the computed results and the experimental observations.
Źródło:
Acta Physica Polonica A; 1995, 87, 3; 599-609
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lattice Dynamics of Metallic Glass Ca$\text{}_{70}$Mg$\text{}_{30}$ on the Model of Bhatia and Singh
Autorzy:
Shukla, M. M.
Campanha, J. R.
Powiązania:
https://bibliotekanauki.pl/articles/1992705.pdf
Data publikacji:
1998-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.50.+x
Opis:
The lattice dynamical studies of the metallic glass Ca$\text{}_{70}$Mg$\text{}_{30}$ by Bhatia and Singh on their model contained two shortcomings, firstly the electron-ion interaction matrix was wrong and secondly, the numerical value of the bulk modulus of the electron gas was accepted arbitrarily. By modifying the electron-ion dynamical matrix and determining all the model parameters from the experimental data, we made a fresh study of the lattice dynamics of Ca$\text{}_{70}$Mg$\text{}_{30}$ and compared it to the earlier studies of Bhatia and Singh and also with experimental phonons.
Źródło:
Acta Physica Polonica A; 1998, 94, 4; 655-660
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vortex Properties in a Model with Local Pairs
Autorzy:
Śledź, Ż.
Mierzejewski, M.
Maśka, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/2046800.pdf
Data publikacji:
2006-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
74.20.-z
Opis:
We investigate the vortex structure in the Penson-Kolb model with and without impurities. We focus on the consequences arising from the non-local field-dependent pairing interaction for the vortex profile, current distribution, and the local density of states.
Źródło:
Acta Physica Polonica A; 2006, 109, 4-5; 653-656
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical and Thermal Conductivities of Some Sulphate Compounds
Autorzy:
Abdel-Kader, M. M.
Mosaad, M. M.
Olofa, S. A.
Abdel-Ati, M. I.
El-Shawarby, A.
Powiązania:
https://bibliotekanauki.pl/articles/1928267.pdf
Data publikacji:
1993-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Jf
Opis:
The electrical conductivity σ and the thermal conductivity λ were investigated at varying temperature (40 < T < 120°C) for two sulphate compounds, anhydrous mercury(II) sulphate HgSO$\text{}_{4}$ and cerous(III) sulphate Ce$\text{}_{2}$(SO$\text{}_{4}$)$\text{}_{3}$·H$\text{}_{2}$O. It seems likely that each of the two sulphate salts undergoes structural phase transition around 90°C. The differential thermal analysis thermogram was carried out as an aid for confirming of the observed phase transitions. The mechanism of the heat transfer is mainly due to phonons. Interpretation of the obtained data was given on the basis of the reorientational motion of the SO$\text{}_{4}$‾ ‾ ions.
Źródło:
Acta Physica Polonica A; 1993, 83, 2; 187-194
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charge Density Waves in Small Metallic and Superconducting Rings
Autorzy:
Maśka, M. M.
Czajka, K.
Mierzejewski, M.
Śledź, Ż.
Powiązania:
https://bibliotekanauki.pl/articles/2046736.pdf
Data publikacji:
2006-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.Ra
74.78.-w
Opis:
Experimental results concerning persistent currents in small rings threaded by a magnetic flux do not agree with theoretical predictions, especially for experiments performed in diffusive regime. This suggests important role of disorder in these experiments. In this paper we demonstrate how impurities present in ring modify the persistent current by generating or enhancing charge density waves. The electronic correlations are taken into account for both repulsive as well as attractive electron-electron interaction. The calculations are carried out for one-dimensional rings consisting of up to 12 lattice sites using Lanczös exact diagonalization approach, and for finite-width much larger rings using the Bogolyubov-de Gennes equations.
Źródło:
Acta Physica Polonica A; 2006, 109, 4-5; 519-525
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Binding Energy of an Off-Center Hydrogenic Donor Impurity in a Finite Confining Potential Quantum Well
Autorzy:
Mikhail, I. F. I.
Ismail, I. M. M.
Powiązania:
https://bibliotekanauki.pl/articles/2047296.pdf
Data publikacji:
2007-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.-m
71.55.-i
Opis:
The binding energy of an off-center hydrogenic donor impurity in a finite confining potential quantum well was calculated by using a variational method of the Bastard type. New analytical expressions for the binding energy and for the initial deviation from the result of an infinite confining potential well were derived for the ground energy state. The sign of the initial deviation was found to depend on the location of the impurity. The analytical expressions were utilized further to derive some other important parameters.
Źródło:
Acta Physica Polonica A; 2007, 111, 3; 373-385
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 4586

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