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Wyświetlanie 1-15 z 53
Tytuł:
Magnetic Anisotropy and Exchange Interactions in R$\text{}_{n+1}$Co$\text{}_{3n+5}$B$\text{}_{2}$n Compounds
Autorzy:
Kowalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1931246.pdf
Data publikacji:
1994-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.30.Et
Opis:
The individual Co site contributions to the magnetocrystalline anisotropy in RCo$\text{}_{5}$, RCo$\text{}_{4}$B and R$\text{}_{3}$Co$\text{}_{11}$B$\text{}_{4}$ compounds have been studied. An analysis is given of the room temperature anisotropy constants of these compounds by using a model of Streever. The values of the rare earth-transition metal exchange coupling J$\text{}_{RCo}$/k$\text{}_{B}$ derived by mean field analysis of the Curie temperatures are -11.2 K, -15 K and -20.9 K, respectively. In general, a decrease in J$\text{}_{RCo}$/k$\text{}_{B}$ with increasing Co concentration is observed.
Źródło:
Acta Physica Polonica A; 1994, 85, 3; 623-626
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of DyCo$\text{}_{5}$ and DyCo$\text{}_{3}$B$\text{}_{2}$ Compounds
Autorzy:
Jezierski, A.
Kowalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/2028907.pdf
Data publikacji:
2001-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
72.15.Eb
Opis:
We study the electronic structure of the hexagonal DyCo$\text{}_{5}$ and DyCo$\text{}_{3}$B$\text{}_{2}$ compounds. The magnetic moments and the band structures were calculated by ab initio self-consistent tight binding linear muffin-tin orbital method within the atomic sphere approximation. These compounds crystallize in a hexagonal structure having the P6/mmm space group. The substitution of cobalt by boron atoms changes the local environment of remaining Co atoms and leads to the decrease in the local magnetic moments as well as in the Curie temperature.
Źródło:
Acta Physica Polonica A; 2001, 100, 4; 565-572
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Destructive Characterization, Inspection, Failure Analysis of Advanced Components and Sensors with a High Resolution and High Contrast Micro XCT System
Autorzy:
Lau, S.
Kowalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1807674.pdf
Data publikacji:
2009-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Źródło:
Acta Physica Polonica A; 2009, 116, S; S-192-S-193
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of Boron in Nd(Co$\text{}_{1-x}$B$\text{}_{x}$)$\text{}_{5}$ System
Autorzy:
Kowalczyk, A.
Smardz, L.
Powiązania:
https://bibliotekanauki.pl/articles/1964570.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.30.Et
Opis:
The influence of boron atoms on the magnetic properties of Νd(Co$\text{}_{1-x}$B$\text{}_{x}$)$\text{}_{5}$ (i.e. ΝdCo$\text{}_{5}$, NdCo$\text{}_{4}$B, Νd$\text{}_{3}$Co$\text{}_{11}$Β$\text{}_{4}$ and Νd$\text{}_{2}$Co$\text{}_{7}$Β$\text{}_{3}$) compounds has been studied. These structures are based on the well-known CaCu$\text{}_{5}$ structure. They all have the hexagonal symmetry and belong to the space group of P6/mmm. The experimental values of the Curie temperatures (T$\text{}_{c}$) of Nd(Co$\text{}_{1-x}$B$\text{}_{x}$)$\text{}_{5}$ are used to calculate the effective intersublattice exchange interactions (J$\text{}_{NdCO}$) between Nd and Co sublattices. As the Β content increases, a tendency to decrease in J$\text{}_{NdCO}$ and T$\text{}_{c}$ is found. This variation is compared with that observed for the Co magnetic moment.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 285-288
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermoelectric Power and Thermal Conductivity of Heavy Fermion $CeCu_4Al$
Autorzy:
Falkowski, M.
Kowalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1426875.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
72.15.Eb
72.15.Jf
72.15.Qm
Opis:
The thermal conductivity and thermopower are discussed for the heavy fermion $CeCu_4Al$ compound. $CeCu_4Al$ is paramagnetic and follows the modified Curie-Weiss law with $μ_{eff}$ = 2.53 $μ_{B}$/f.u. and $\Theta_{P}$ = - 10 K indicating on the presence of well localized magnetic moments of $Ce^{3+}$ ions. The determined electronic specific heat coefficient γ = 2.2 J $mol^{-1}K^{-2}$ confirms the heavy fermion character of this compound. Thermopower is positive over the whole temperature range and below $T_{max}$ = 25 K falls rapidly. Based on a simple band model the position and width of the 4f peak nearest to the Fermi level have been estimated. The measured total thermal conductivity of the $CeCu_4Al$ compound increases almost linearly with increasing temperature.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1056-1058
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetocaloric Effect in $NdNi_4Si$ Compound
Autorzy:
Falkowski, M.
Toliński, T.
Kowalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1429061.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.30.Kz
75.47.Np
75.40.-s
Opis:
On the basis of the thermodynamic approach, we report the magnetocaloric properties of the ternary ferromagnetic $NdNi_4Si$ compound with magnetic phase transition temperature $T_{C}$ at 8 K. The saturated magnetic moment in H = 9 T is equal to 1.5 $μ_{B}$/f.u. at 4.2 K and the compound crystallizes in the hexagonal $CaCu_5$-type structure (space group P6/mmm). The magnetocaloric effect was calculated in terms of the isothermal magnetic entropy change Δ $S_{M}$ as well as the adiabatic temperature change Δ $T_{ad}$ using the specific heat data and magnetization measurements. Within the second order phase transition significant values of these parameters have been observed.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1290-1292
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific Heat of $YbNi_4Si$ Compound
Autorzy:
Falkowski, M.
Kowalczyk, A.
Toliński, T.
Powiązania:
https://bibliotekanauki.pl/articles/1813487.pdf
Data publikacji:
2008-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.80.Pv
65.40.Ba
75.20.Hr
Opis:
The specific heat of $YbNi_4Si$ has been analyzed considering the electronic contribution and the lattice contributions in frames of the Debye model. Based on the specific heat measurements, the electronic specific heat coefficient γ = 25 mJ $mol^{-1} K^{-2}$ and the Debye temperature $θ_D$ = 320 K were derived. This small value shows that $YbNi_4Si$ cannot be classified as a heavy fermion system. These studies are completed by magnetic susceptibility, X-ray photoemission spectroscopy, and electrical resistivity.
Źródło:
Acta Physica Polonica A; 2008, 113, 2; 641-644
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Transition in La$\text{}_{1}\text{}_{/}\text{}_{3}$ Nd$\text{}_{1}\text{}_{/}\text{}_{3}$ Ca$\text{}_{1}\text{}_{/}\text{}_{3}$ MnO$\text{}_{3}$ Perovskite Induced by Electric Field at a Given Magnetic Field
Autorzy:
Baszyński, J.
Kowalczyk, A.
Kováč, J.
Powiązania:
https://bibliotekanauki.pl/articles/2013719.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Et
Opis:
We report the discovery of new effect in La$\text{}_{1}\text{}_{/}\text{}_{3}$ Nd$\text{}_{1}\text{}_{/}\text{}_{3}$ Ca$\text{}_{1}\text{}_{/}\text{}_{3}$ MnO$\text{}_{3}$ - the jump of magnetization induced by external electric field E (2.5-4)V/cm at a given magnetic field H (18-25) kOe at T=4.2 K. This effect is large when compared with a metamagnetic transition induced by the magnetic field in many substances. The origin of the magnetization jump induced by external electric field has not yet been explained. We assume that this transition is induced by the hopping of E-excited e$\text{}_{g}$ electrons and that this is a source of a jumpwise increase in magnetization in the non-collinear magnetic phase within the perovskite. This effect can be attributed to a strong coupling between carriers induced by the electric field (the conduction electrons e$\text{}_{g}$), and the local magnetic moments (t$\text{}_{2g}$-localized spins) through a mechanism of the Zener double exchange.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 879-882
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Negative Magnetisation and Absence of Superconductivity in RFe$\text{}_{4}$Al$\text{}_{8}$ (R=Lu, Yb) Compounds
Autorzy:
Andrzejewski, B.
Kowalczyk, A.
Toliński, T.
Powiązania:
https://bibliotekanauki.pl/articles/2046747.pdf
Data publikacji:
2006-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Dd
75.50.-y
75.50.Ee
51.60.+a
74.70.-b
Opis:
We report researches for superconductivity and the effect of negative magnetisation in the RFe$\text{}_{4}$Al$\text{}_{8}$ (R = Lu, Yb) compounds by means of magnetic measurements and microwave absorption. Contrary to the earlier reports we do not confirm the existence of any traces of superconductivity in these compounds. Instead of the superconductivity and the Meissner effect, the YbFe$\text{}_{4}$Al$\text{}_{8}$ compound exhibits the effect of negative magnetisation, whereas the LuFe$\text{}_{4}$Al$\text{}_{8}$ compound shows an exact antiferromagnetic behaviour.
Źródło:
Acta Physica Polonica A; 2006, 109, 4-5; 561-564
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure and X-Ray Photoelectron Spectra of YNi$\text{}_{4}$B Compound
Autorzy:
Pugaczowa-Michalska, M.
Chełkowska, G.
Kowalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/2036993.pdf
Data publikacji:
2003-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
82.80.Pv
71.20.-b
63.70.+h
Opis:
The electronic structure of the ternary YNi$\text{}_{4}$B compound, crystallizing in the hexagonal CeCo$\text{}_{4}$B structure (P6/ mmm space group), was studied by X-ray photoelectron spectroscopy and ab initio calculations. Core levels and the valence band were investigated. The X-ray photoelectron spectroscopy valence band is compared with that obtained from ab initio calculations. The valence band spectrum at the Fermi level exhibits the domination of the Ni(3d) states, which are hybridized with 4d states of Y and 2p states of B. The theoretical electronic specific heat coefficientγ derived from N(E$\text{}_{F}$) is about 11.33 mJ/(mol K$\text{}^{2}$) for experimental lattice parameters. The calculated bulk modulus is B$\text{}_{0}$=1.61632 Mbar.
Źródło:
Acta Physica Polonica A; 2003, 104, 5; 487-494
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of UCo$\text{}_{4}$B Compound
Autorzy:
Szajek, A.
Smardz, L.
Szlaferek, A.
Kowalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/2014433.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.80.Pv
71.20.-b
Opis:
UCo$\text{}_{4}$B is a member of uranium intermetallic borides family which crystallizes in the hexagonal CeCo$\text{}_{4}$B structure. The experimental data suggest the occurrence of the spin-fluctuation behaviour of UCo$\text{}_{4}$B. In this paper we present the results of band structure calculations using the ab-initio tight binding linear muffin-tin orbital method. We found good agreement between the experimental X-ray photoemission spectroscopy valence band spectrum and the ab-initio results.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 599-603
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic, Magnetic and Transport Properties of YCo$\text{}_{3}$B$\text{}_{2}$ Compound
Autorzy:
Kowalczyk, A.
Jezierski, A.
Smardz, L.
Baszyński, J.
Powiązania:
https://bibliotekanauki.pl/articles/2013655.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Eb
75.20.En
Opis:
We studied the electronic, magnetic and transport properties of the hexagonal YCo$\text{}_{3}$B$\text{}_{2}$ compound. The electronic structure was studied by X-ray photoemission spectroscopy and ab initio self-consistent tight binding linear muffin tin orbital method. We found a good agreement between the experimental X-ray photoemission spectroscopy valence band spectra and theoretical calculations. Theoretical calculations showed that the YCo$\text{}_{3}$B$\text{}_{2}$ is a paramagnet in agreement with experimental results. Electrical resistivity at low temperatures shows a T$\text{}^{2}$ dependence, implying that the scattering by the spin fluctuactions is dominant in this temperature range.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 803-806
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermoelectric Properties of $CeCu_4Ag$ Compound
Autorzy:
Kowalczyk, A.
Toliński, T.
Falkowski, M.
Timko, M.
Powiązania:
https://bibliotekanauki.pl/articles/1534756.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
65.80.-g
72.15.Cz
72.20.Pa
Opis:
The magnetic and electronic properties including electrical resistivity, thermal conductivity and thermopower are discussed for the heavy fermion $CeCu_4Ag$ compound. The electrical resistivity shows a Kondo-like logarithmic increase up to a maximum at T = 75 K. Thermopower is positive over the whole temperature range and below $T_\text{max}$ = 25 K falls rapidly. The measured thermal conductivity of the $CeCu_4Ag$ compound increases with increasing temperature.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 936-937
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconducting Properties of Mo$\text{}_{2}$Re$\text{}_{3}$B$\text{}_{x}$-Mo$\text{}_{3}$Re$\text{}_{2}$B$\text{}_{x}$ Eutectic
Autorzy:
Andrzejewski, B.
Guilmeau, E.
Kowalczyk, A.
Jurga, W.
Powiązania:
https://bibliotekanauki.pl/articles/2047335.pdf
Data publikacji:
2007-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Yz
74.10.+v
74.25.Ha
74.25.Nf
74.50.+r
Opis:
We synthesized, for the first time, superconducting eutectic composed of two new superconducting phases, namely of Mo$\text{}_{2}$Re$\text{}_{3}$B$\text{}_{x}$ and of Mo$\text{}_{3}$Re$\text{}_{2}$B$\text{}_{x}$ (where x≈1) and investigated its basic transport, magnetic, and microwave properties. The transition temperatures T$\text{}_{c}$ were equal to 6.6 K and to 8.7 K for Mo$\text{}_{3}$Re$\text{}_{2}$B$\text{}_{x}$ and Mo$\text{}_{2}$Re$\text{}_{3}$B$\text{}_{x}$ compound, respectively. The phases present in the eutectic were identified by means of energy dispersion spectroscopy analyses. It was also shown that the two phases in the eutectic were separated by thin boron interface and formed regular network of the Josephson junctions which very effectively absorbed microwave energy.
Źródło:
Acta Physica Polonica A; 2007, 111, 5; 727-735
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Properties of CeNiAl₄ Based on ab initio Calculations and XPS Measurements
Autorzy:
Werwiński, M.
Chełkowska, G.
Szajek, A.
Kowalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1030430.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.b
74.25.Jb
Opis:
The CeNiAl₄ compound crystallizes in an orthorhombic YNiAl₄-type structure with a Cmcm space group. The earlier susceptibility data and X-ray photoelectron spectroscopy (XPS) suggested a localized character of the 4f states in CeNiAl₄ with a valence state close to a Ce⁺³ ion. In this work we present a combined theoretical and experimental study of the electronic structure for the Kondo dense system CeNiAl₄ based on the XPS data and ab initio calculations. Using the band structure calculations the theoretical XPS valence band spectra are evaluated. Below the Fermi energy the total density of states contains mainly 3d states of Ni hybridized with Ce 4f states.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 517-519
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 53

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