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    Wyświetlanie 1-10 z 10
    Tytuł:
    Magnetism and Specific Heat of TmRhX (X = Ga, Ge) Compounds
    Autorzy:
    Baran, S.
    Przewoźnik, J.
    Szytuła, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399029.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.-m
    75.30.kz
    75.40.Cx
    75.47.Np
    Opis:
    Magnetic and specific heat data of the TmRhX (X = Ga, Ge) compounds are reported. These compounds crystallize in an orthorhombic crystal structure of the TiNiSi-type (space group Pnma). Magnetic data indicate that the compounds are antiferromagnets with the Néel temperature $T_{N}$ equal to 3.9 K for TmRhGa and 6.0 K for TmRhGe. Magnetic susceptibility of TmRhGe has an additional peak at $T_{t}$ = 10.6 K. In TmRhGe temperature dependence of χ"(T), the positions of both the peaks at $T_{N}$ and $T_{t}$ change with frequency indicating a relaxation process. These data suggest that with the decreasing temperature, first a cluster glass state and next the long-range aniferromagnetic order exists.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 998-1001
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of $Dy_{11}Si_4In_6$
    Autorzy:
    Duraj, D.
    Baran, S.
    Jaworska-Gołąb, T.
    Kalychak, Ya.
    Przewoźnik, J.
    Szytuła, A.
    Tyvanchuk, Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427191.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.40.-s
    75.40.Gb
    65.40.gd
    Opis:
    Magnetic and specific heat measurements of $Dy_{11}Si_4In_6$ are reported. This compound crystallizes in the tetragonal $Sm_{11}Ge_4In_6$-type crystal structure (space group I4/mmm), in which Dy atoms occupy four different sites. The AC and DC magnetic measurements suggest complex magnetic properties. Below $T_{c}$ = 52 K magnetic ordering has a ferromagnetic component, while below 20 K a change of the properties is observed. Near the Curie temperature the magnetocaloric effect with the magnetic entropy change $\Delta S_{m}$ equal to 16.5 J/(kg K) is observed. The specific heat data indicate only the phase transition at 52 K.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1118-1120
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetization, Susceptibility and Critical Currents of $(Tl_{2-x}Re_{x})Ba_{2}CaCu_{2}O_{y}$ Thin Films
    Autorzy:
    Woch, W.
    Dujavová, A.
    Przewoźnik, J.
    Zalecki, R.
    Kołodziejczyk, A.
    Sojková, M.
    Chromik, Š.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431480.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    70.72.Gr
    74.25.Ha
    Opis:
    The magnetization and the AC susceptibility vs. the temperature as well as the applied magnetic field of the thin film $(Tl_{2-x}Re_{x})Ba_{2}CaCu_{2}O_{y}$ with x=0 and 0.15 on R-plane sapphire substrate with $CeO_{2}$ buffer layer were measured and analyzed. XRD measurements show c-axis as well as a-b plane oriented Tl-1212 and superconducting pure phase. The zero critical temperature of the Tl-Re sample is 99.9 K and is practically the same as the critical temperature of the rhenium free sample: 99.5 K. The Tl-Re superconductor exhibits two peaks of the absorption part of AC susceptibility in the vicinity of the critical temperature in contrary to the rhenium free sample. The first peak placed in higher temperature is related to intragranular properties while the second peak is connected with the intergranular one. The critical current densities versus temperature were calculated from AC susceptibility as well as from the magnetization loops measurements using the Bean's critical state model. The Tl-Re film exhibits the higher critical current in comparison to the rhenium free thallium based film.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 845-849
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoresistance study of c-axis oriented YBCO thin film
    Autorzy:
    Chrobak, M.
    Woch, W.
    Kowalik, M.
    Zalecki, R.
    Giebułtowski, M.
    Przewoźnik, J.
    Kapusta, Cz.
    Szwachta, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054863.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.78.-w
    74.25.Op
    74.25.Qt
    74.78.Bz
    Opis:
    The c-axis orientation YBa₂Cu₃O_δ thin film was prepared directly on MgO substrate by the pulse laser deposition. The thickness of the film is 170 nm. The superconducting critical temperature is T_{c50%}=87.5 K and the width of superconducting transition is ΔT = 1.8 K. The temperature dependences of magnetoresistance were measured up to 90 kOe. The widths of the transition to the superconducting state versus applied magnetic field were derived and they were fitted using the formula: Δ T=CH^m +Δ T₀. The irreversibility fields as a function of temperature were obtained and fitted by the de Almeida and Thouless-like equation: H_{irr}=H_{irr0}(1-T/T_{c0})^n. The irreversibility field at the liquid nitrogen temperature was calculated and it is H_{irr}=43.8 kOe when the applied magnetic field is parallel to the c-axis.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1018-1020
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Pressure Mössbauer Studies of Magnetism in ScFe$\text{}_{2}$ and Sc$\text{}_{0.4}$Ti$\text{}_{0.6}$Fe$\text{}_{2}$ Laves Phases
    Autorzy:
    Rupprecht, K.
    Lu, J.
    Wortmann, G.
    Przewoźnik, J.
    Żukrowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2029022.pdf
    Data publikacji:
    2001-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    76.80.+y
    Opis:
    We report on $\text{}^{57}$Fe-Mössbauer studies of the magnetic properties in ScFe$\text{}_{2}$ and Sc$\text{}_{0.4}$Ti$\text{}_{0.6}$Fe$\text{}_{2}$ performed as a function of pressure and temperature. Both systems crystallize in the C14-type Laves phase structure with two different Fe sites 6h and 2a. The ferromagnetic properties of ScFe$\text{}_{2}$ (T$\text{}_{C}$=540 K at ambient pressure) change around 30 GPa to antiferromagnetic order of the 6h sites with non-magnetic 2a sites. The ordering temperature is lowered to T$\text{}_{N}$=300 K at 51 GPa. This pressure-dependent behaviour of ScFe$\text{}_{2}$ resembles that observed within the Sc$\text{}_{1-x}$Ti$\text{}_{x}$Fe$\text{}_{2}$ series as a function of x. In ferromagnetic Sc$\text{}_{0.4}$Ti$\text{}_{0.6}$Fe$\text{}_{2}$ we observe, as a function of temperature and of pressure, an abrupt high-moment to low-moment transition of the Fe band moments of the 6h sites, accompanied by a rearrangement of the spin directions. In both systems the decrease in the Fe moments is accompanied by a strong increase in the volume coefficient of the isomer shift, originating from a reduced s-electron shielding capability of the d-electrons in the low-moment state.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 5; 789-797
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion Irradiation of Oxidized FeCoZr-CaF₂ Nanocomposite Films for Perpendicular Magnetic Anisotropy Enhancement
    Autorzy:
    Kasiuk, J.
    Fedotova, J.
    Przewoźnik, J.
    Kapusta, C.
    Skuratov, V.
    Svito, I.
    Bondariev, V.
    Kołtunowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030130.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Tt
    75.30.Gw
    81.15.Jj
    81.40.Wx
    81.40.Rs
    61.80.Jh
    Opis:
    The paper is focused on the results of Xe ions irradiation of nanocomposite FeCoZr-CaF₂ films synthesized in the oxygen-containing atmosphere. Combined influence of nanoparticles partial oxidation and ion irradiation with different fluences on the crystalline structure, phase composition and magnetic anisotropy is analysed by X-ray diffraction, the Mössbauer spectroscopy and vibrating sample magnetometry. The origin of the detected progressive enhancement of perpendicular magnetic anisotropy as the result of films oxidation and irradiation is discussed in the context of formation of nanoparticles oxide shells and ion tracks along the films normal.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 206-209
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Carbon on Spin Reorientation Processes in $Er_{2-x}R_xFe_{14}C$ (R~=~Gd, Pr) - Mössbauer and Magnetometric Studies
    Autorzy:
    Pędziwiatr, A.
    Krawiec, K.
    Bogacz, B.
    Kapusta, Cz.
    Przewoźnik, J.
    Kaczorowski, D.
    Talik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506592.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    75.25.-j
    75.50.-y
    75.50.Bb
    Opis:
    The $Er_{2-x}R_{x}Fe_{14}C$ (R=Gd, Pr) polycrystalline compounds have been synthesized and investigated with $\text{}^{57}Fe$ Mössbauer spectroscopy and magnetic measurements. The spin reorientation phenomena were studied extensively by narrow step temperature scanning in the neighborhood of the spin reorientation temperature. Obtained Mössbauer spectra were analyzed using a procedure of simultaneous fitting and the transmission integral approach. Consistent description of Mössbauer spectra were obtained, temperature and composition dependencies of hyperfine interaction parameters and subspectra contributions were derived from fits and the transition temperatures were determined for all the compounds studied. Initial magnetization versus temperature measurements (in zero and non-zero external field) for $Er_{2-x}Gd_{x}Fe_{14}C$ compounds allowed to establish the temperature regions of reorientation, change of magnetization value during the transition process. The results obtained with different methods were analyzed and the spin arrangement diagrams were constructed. Data obtained for $Er_{2-x}Gd_{x}Fe_{14}C$ were compared with those for $Er_{2-x}Gd_{x}Fe_{14}B$ series.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 48-51
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion-Induced Modification of Structure and Magnetic Anisotropy in Granular FeCoZr-CaF₂ Nanocomposite Films
    Autorzy:
    Kasiuk, J.
    Fedotova, J.
    Przewoznik, J.
    Kapusta, Cz.
    Skuratov, V.
    Milosavljevic, M.
    Bondariev, V.
    Koltunowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402191.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Tt
    75.30.Gw
    81.15.Jj
    81.40.Wx
    81.40.Rs
    61.80.Jh
    Opis:
    The paper reports on the results of structural analysis and magnetometry of granular nanocomposite films FeCoZr-CaF₂ irradiated with Xe and Kr ions at different fluences. The observed effect of enhanced perpendicular magnetic anisotropy characterizing pristine films is discussed with respect to the irradiation regimes and structural changes of the films originating from the impact of ions.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 828-831
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NMR ($\text{}^{55}$Mn, $\text{}^{139}$La) and Mössbauer Spectroscopy ($\text{}^{119}$Sn) Studies of (La$\text{}_{0.67}$Ca$\text{}_{0.33}$)(Mn$\text{}_{1-x}$Sn$\text{}_{x}$)O$\text{}_{3-δ}$ Compounds
    Autorzy:
    Przewoźnik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047327.pdf
    Data publikacji:
    2007-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.-k
    76.80.+y
    75.47.Lx
    77.80.Bh
    75.47.Gk
    Opis:
    A $\text{}^{119}$Sn Mössbauer spectroscopy and zero field $\text{}^{55}$Mn and $\text{}^{139}$La NMR studies of (La$\text{}_{0.67}$Ca$\text{}_{0.33}$)(Mn$\text{}_{1-x}$Sn$\text{}_{x}$)O$\text{}_{3-δ}$ (x=0, 0.01, 0.03, andδ≈0.06) were reported. The temperature evolution of the Sn hyperfine field (B$\text{}_{hf}$) for x=0.03 determined from the Mössbauer spectroscopy measurements was analysed within a molecular field model. A fit to the temperature dependence of B$\text{}_{hf}^{max}$ provided the Curie temperature T$\text{}_{C}^{*}$=160(3) K, which is in good agreement with T$\text{}_{C}$ obtained from dc magnetisation measurements. The $\text{}^{55}$Mn NMR spectra for $x=0$ and 0.01 show a single double exchange Mn$\text{}^{3+}\text{}^{/}\text{}^{4+}$ resonance line and exhibit strong Suhl-Nakamura relaxation effects characteristic of the ferromagnetic metallic phase. The spectra for x=0.03 show a coexistence of the double exchange line with the lines characteristic of Mn$\text{}^{3+}$ and Mn$\text{}^{4+}$ valence states. This shows that a 3% Sn doping strongly suppresses the double exchange interaction and leads to microscopic phase segregation into ferromagnetic metal and ferromagnetic insulator.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 5; 649-659
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural, Thermal, Magnetic, and Transport Properties of (La$\text{}_{2}\text{}_{/}\text{}_{3}$ Ca$\text{}_{1}\text{}_{/}\text{}_{3}$ )(Mn$\text{}_{1-x}$Sn$\text{}_{x}$)O$\text{}_{3-δ}$ Compounds
    Autorzy:
    Przewoźnik, J.
    Chmist, J.
    Kolwicz-Chodak, L.
    Tarnawski, Z.
    Kołodziejczyk, A.
    Krop, K.
    Kellner, K.
    Gritzner, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038395.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    75.47.Gk
    75.40.Cx
    Opis:
    The structural, magnetic, and electrical transport properties of Sn-doped manganite La$\text{}_{0.67}$Ca$\text{}_{0.33}$Mn$\text{}_{1-x}$ Sn$\text{}_{x}$O$\text{}_{3-δ}$ (x=0, 0.01, 0.03, andδ≈0.06) compounds were studied using X-ray powder diffraction, scanning electron microscopy, AC susceptometer and vibrating sample magnetometer measurements as well as four-probe resistance measurements. The specific heat was measured by the heat-pulse method. The Curie temperature T$\text{}_{C}$ and the metal-insulator transition temperature T$\text{}_{M-I}$ decreased nonlinearly with increasing Sn content. The T$\text{}_{C}$ and T$\text{}_{M-I}$ values, for the x=0, 0.01, and 0.03 compounds were separated by 18.2 K, 66.3 K, and 10 K, respectively. The resistivity above T$\text{}_{C}$ for all of these compounds followed the Mott variable-range-hopping model. This allowed the estimation of the localization lengths of 2.2Å (x = 0), 1.33Å (x=0.01) and 1.26Å (x=0.03). The x=0 and x=0.01 compounds exhibited anomalies of R(T) at corresponding T$\text{}_{C}$ and allowed the separation of the magnitude of the purely magnetic contribution to the resistance which for x=0 was≈5 .7Ω and for x=0.01,≈22 .4Ω. The specific heat of the Sn-free sample exhibited a sharp peak at T$\text{}_{C}$. With increasing Sn content the peak at T$\text{}_{C}$ broadened and the area under the peak decreased. For x= 0.03 the peak was hardly detectable. Our results on La$\text{}_{0.67}$Ca$\text{}_{0.33}$ Mn$\text{}_{1-x}$Sn$\text{}_{x}$O$\text{}_{3}$ reveal that a small substitution of Sn$\text{}^{4+}$ for Mn$\text{}^{4+}$ suppresses double exchange interactions and strongly affects the magnetic, thermal, and transport properties of the parent compound.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 665-680
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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