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    Wyświetlanie 1-14 z 14
    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:
    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:
    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:
    Valence Band and Core Levels of $Ce_5Ni_2Si_3$ Crystal Studied by X-ray Photoemission Spectroscopy
    Autorzy:
    Toliński, T.
    Kowalczyk, A.
    Chełkowska, G.
    Mihalik, M.
    Timko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813673.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    82.80.Pv
    Opis:
    The crystal of $Ce_5Ni_2Si_3$ was prepared by the Czochralski method. The X-ray photoemission spectroscopy was measured for the valence band and the core levels. Based on the Ce(3d) doublet and its satellites a small value of the hybridization parameter of the f-states with the conduction electrons Δ=4 meV and the f-occupancy $n_f$ close to 1 were found. X-ray photoemission spectroscopy shows that the region between 0 and 3 eV is predominated by the Ni(3d) and Ce(4f) peaks. Some features of the multiplet structure of the Ce(4f) states are also visible close to the Fermi level.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 327-330
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Magnetic Circular Dichroism Studies on $CeNi_4B$
    Autorzy:
    Toliński, T.
    Cezar, J.
    Wende, H.
    Kowalczyk, A.
    Baberschke, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810402.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    75.20.Hr
    78.70.Dm
    79.60.-i
    78.20.Ls
    Opis:
    The $CeNi_4B$ compound is a mixed-valence system. It is a paramagnet with $μ_\text{eff}$= 0.52 $μ_{B}$/f.u. and the paramagnetic Curie temperature θ= -10.7 K. In the present research we complete our previous magnetic susceptibility and X-ray photoemission measurements with new studies by the X-ray magnetic circular dichroism method. The observation of the Ce $M_{4,5}$ edges carried out with X-ray magnetic circular dichroism confirms the mixed-valence state deduced previously from X-ray photoemission spectroscopy. Moreover, we report on the measurements of the Ni $L_{2,3}$ edges, which enable verification of the Ni contribution to the magnetism of this compound.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 129-131
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties and Magnetocaloric Effect of $DyNi_{4}Si$
    Autorzy:
    Synoradzki, K.
    Kowalski, W.
    Falkowski, M.
    Toliński, T.
    Kowalczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367640.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    75.30.Sg
    75.40.Cx
    81.20.Ev
    Opis:
    The magnetic properties and magnetocaloric effect (MCE) in $DyNi_{4}Si$ have been studied by the magnetization and specific heat measurements. The saturation magnetic moment in $μ_{0}H$=9 T is equal to 7.9 $μ_{B}$/f.u at 4.2 K. A significant MCE has been observed around the second order phase transition at $T_{C}$=11 K. The maximum magnetic entropy change is -Δ $S_{M}$=14.5 J $kg^{-1}K^{-1}$ for the magnetic field change of 9 T.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 162-163
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat Capacity of Heavy Fermion Compound $CeCu_4Ga$ in High Magnetic Fields
    Autorzy:
    Kowalczyk, A.
    Toliński, T.
    Reiffers, M.
    Zapotoková, M.
    Falkowski, M.
    Gažo, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810399.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.Ba
    71.20.Eh
    71.27.+a
    Opis:
    The heat capacity in the applied magnetic field up to 9 T, susceptibility and magnetization of polycrystalline $CeCu_{4}Ga$ are presented. Magnetic ordering was not observed down to 2 K. For temperature T < 200 K a Curie-Weiss behavior is observable giving an effective magnetic moment $μ_\text{eff}$ =2.53 $μ_{B}$/f.u. The experimental value of $μ_\text{eff}$ is close to the calculated one for a free $Ce^{3+}$ ion ($μ_\text{eff}$ = 2.54 $μ_{B}$/f.u.), thus indicating the presence of well localized magnetic moments carried by the stable $Ce^{3+}$ ions. At low temperatures the electronic heat capacity coefficient value depends strongly on the temperature range used for the extrapolation and applied magnetic field. We observe a typical heavy fermion behavior with γ value of about 380 mJ $\text{mol}^{-1} K^{-2}$ obtained from extrapolation to T = 0 K of the temperature range above 7 K. However, extrapolation of the lowest temperatures range yields the γ value of 3.3 J $\text{mol}^{-1} K^{-2}$.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 123-125
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat Capacity Studies of $NdNi_4Si$ Compound
    Autorzy:
    Falkowski, M.
    Reiffers, M.
    Zapotoková, M.
    Kowalczyk, A.
    Toliński, T.
    Gažo, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810401.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.De
    65.40.gd
    71.20.Eh
    71.70.-d
    Opis:
    The study of the heat capacity of the intermetallic compound $NdNi_{4}Si$ including the effect of the magnetic field is reported. This compound crystallizes in the hexagonal $CaCu_5$-type structure, space group P6/mmm. $NdNi_{4}Si$ is ferromagnetic with $T_C$ = 8 K and the saturation magnetic moment of 1.5 $μ_{B}$/f.u. at 4.2 K (in H = 9 T). The heat capacity was analyzed considering the electronic contribution, the Schottky anomaly, and the lattice contributions in the frames of the Debye model. The scheme of the energy levels created by the crystal electric field split is determined from the Schottky contribution to the specific heat. $NdNi_{4}Si$ was characterized by the electronic heat capacity coefficient γ = 85 mJ/(mol $K^2$) and the Debye temperature $Θp_D$ = 325 K.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 126-128
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low Temperature Properties of the $Ce_{1-x}La_{x}NiAl_4$
    Autorzy:
    Toliński, T.
    Kowalczyk, A.
    Reiffers, M.
    Šebek, J.
    Šantavá, E.
    Curlik, I.
    Ilkovič, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534742.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    65.40.Ba
    75.30.Mb
    Opis:
    Measurements of the heat capacity in ultralow temperatures (down to 350 mK) have been carried out for $Ce_{1-x}La_{x}NiAl_4$. The paramagnetic behavior above about 30 K can be well described by the Curie-Weiss magnetic susceptibility. The undoped CeNiAl_4 compound is a known heavy fermion system with a large electronic specific heat coefficient (γ = 0.5 J $mol^{-1} K^{-2}$) and the Kondo temperature in the range 30-80 K. In the case of the $Ce_{0.8}La_{0.2}NiAl_4$ and $Ce_{0.6}La_{0.4}NiAl_4$ compounds a peak in C/T appears below 2 K, which is strongly damped by the magnetic field. It is probably connected with the Kondo and/or magnetic interactions and the electronic specific heat coefficient is 0.19 J $mol^{-1} K^{-2}$ (0.43 J $mol^{-1} K^{-2}$) for x = 0.2 (x = 0.4) at T → 0. The value determined above the peak, at temperature for which the magnetic field starts to decrease γ ( ≈ 3 K), is about 0.5 J $mol^{-1} K^{-2}$ and the effect of the magnetic field can be well analyzed in frames of the single-ion Kondo model.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 933-935
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From Heavy Fermion and Spin-Glass Behavior to Magnetic Order in $CeT_4M$ Compounds
    Autorzy:
    Toliński, T.
    Kowalczyk, A.
    Falkowski, M.
    Synoradzki, K.
    Chełkowska, G.
    Hoser, A.
    Rols, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1426703.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    71.27.+a
    75.30.Mb
    75.30.Cr
    75.50.Lk
    78.70.Nx
    Opis:
    We report on the transitions between the ferromagnetic order, spin-glass behavior, heavy fermion and fluctuating valence state in a series of isostructural compounds $CeT_4M$ (T = Ni, Cu; M = Al, Ga, Mn). The dilution of Ce or the T and M elements allowed us to follow the physical properties evolution employing the measurements of the heat capacity, dc magnetic susceptibility, frequency dependent ac magnetic susceptibility, magnetization relaxation, inelastic neutron scattering and also the X-ray photoemission spectroscopy. It is shown that the Mn rich compounds lean towards the spin glass behavior. For the compounds governed by the close to localization Ce 4f states the effect of the crystal electric field has been studied. It has been shown that the spin glass-like behavior can significantly influence the physics of the $CeT_4M$ compounds.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1014-1018
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconductivity and Electronic Structure of the W$\text{}_{7}$Re$\text{}_{13}$B Compound
    Autorzy:
    Kowalczyk, A.
    Andrzejewski, B.
    Jezierski, A.
    Toliński, T.
    Szlaferek, A.
    Falkowski, M.
    Chełkowska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046770.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    74.70.-b
    74.25.Ha
    74.25.Jb
    82.80.Pv
    Opis:
    The superconductor W$\text{}_{7}$Re$\text{}_{13}$B has been studied by the magnetic measurements and microwave absorption. The crystal structure of W$\text{}_{7}$Re$\text{}_{13}$B is cubic (β-Mn type). This compound exhibits a sharp superconducting transition at a temperature of T$\text{}_{c}$=7.2 K. The electronic structure of W$\text{}_{7}$Re$\text{}_{13}$B has been studied by X-ray photoelectron spectroscopy and the band structure has been calculated by the full-potential local-orbital minimum-basis method using the scalar-relativistic mode. The main contribution to the density of states at the Fermi level is from 5d electrons of W and Re. The W and Re bands are similar and substituting W by Re does not change the total density of states.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 597-600
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic States of $UNi_2$ from Photoemission Spectroscopy
    Autorzy:
    Zalecki, R.
    Kołodziejczyk, A.
    Kim-Ngan, N.
    Adamska, A.
    Kowalczyk, A.
    Toliński, T.
    Mihalik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813761.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    79.60.Bm
    71.15.Ap
    Opis:
    We measured the angle-resolved ultraviolet and X-ray photoemission spectra of $UNi_2$ single crystal. The valence band angle-resolved ultraviolet photoemission spectra were compared to the accessible band structure calculations. For $UNi_2$ the lowest binding energy strong emission at about -0.1 eV comes from U 5f states and overlaps with the Fermi edge. A small feature at -0.6 eV was ascribed also to U 5f electrons with more localised character. The higher-energy two-peak structure at about -1.2 eV and -2.1 eV comes from Ni 3d states. X-ray photoemission spectroscopy shows the standard two-line spin-orbit splitting of the Ni 2p states and of the U 4f states. Some hybridisation of the Ni 3d and U 5f state was observed in the spectra. The pronounced satellites to the Ni 2p and 3p states, associated with the on-site Coulomb repulsion and other electron correlation energies, were observed.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 407-412
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat Capacity and Susceptibility of $CeCu_4Al$
    Autorzy:
    Reiffers, M.
    Gažo, E.
    Timko, M.
    Kowalczyk, A.
    Toliński, T.
    Andrzejewski, B.
    Šebek, J.
    Šantavá, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813775.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    75.30.Mb
    Opis:
    The heat capacity in the applied magnetic field up to 9 T, susceptibility and magnetization of polycrystalline $CeCu_4Al$ are presented. The determined electronic heat capacity coefficient γ= 210 mJ $mol^{-1} K^{-2}$ confirmed heavy fermion character of this compound. Magnetic ordering was not observed down to 0.5 K. Magnetic properties confirm these observations.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 425-428
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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