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Wyświetlanie 1-15 z 94
Tytuł:
Structural and Magnetic Properties of the $PrNi_{1-x}Cu_{x}Al$ Series
Autorzy:
Fikáček, J.
Javorský, P.
Klicpera, M.
Šantavá, E.
Powiązania:
https://bibliotekanauki.pl/articles/1534261.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
Opis:
Polycrystalline samples of $PrNi_{1-x}Cu_{x}Al$ series were studied by X-ray diffraction, magnetization and specific heat. The hexagonal ZrNiAl-type structure is preserved in the whole series. Compounds with x up to 0.4 order antiferromagnetically with the Néel temperatures between 3 and 5 K. The rest of the compounds (x = 0.5-0.9) exhibits a transition into a spin glass state below the freezing temperatures around 4 K. The analysis of the specific heat data reveals a quasi-doublet ground state well separated from higher crystal field levels in the whole series.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 884-885
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of the Experimental Molecular-Based Ring-Shaped Nanomagnets
Autorzy:
Antkowiak, M.
Kozłowski, P.
Musiał, G.
Florek, W.
Kamieniarz, G.
Esposito, F.
Powiązania:
https://bibliotekanauki.pl/articles/1534905.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
75.40.Mg
Opis:
Quantum transfer matrix technique and numerically exact diagonalization method are applied to the Heisenberg spin systems to model ring-shaped molecules. Two cases are investigated: (i) a dozen of S = 1 spins with additional biquadratic exchange and (ii) a dimetallic molecule $Cr_7Cd$, where it is assumed that exchange anisotropy is determined in a local coordination system. In the latter case the calculated susceptibility is compared with experimental results.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 965-966
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Transitions in Magnetic and Superconducting Systems with Fluctuating Valence. Chemical Potential Evidence
Autorzy:
Gosławska, E.
Matlak, M.
Eid, Kh.
Powiązania:
https://bibliotekanauki.pl/articles/2013336.pdf
Data publikacji:
2000-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
75.40.Cx
Opis:
We investigate the critical behaviour of the chemical potential and average occupation numbers using the extended s -f model with intersite Cooper pairing for systems with fluctuating valence. The model is able to describe phase transitions from normal ferromagnet to normal paramagnet at $T=T_{C}$, from superconducting paramagnet to normal paramagnet at $T=T_{S}$, as well as reentrant phase transitions with three critical temperatures $T_{S_{1}}, T_{C}$ and $T_{S_{2}} (T_{S_{1}} < T_{C} < T_{S_{2}})$. Present investigation, as well as recent results obtained for another models suggest one-to-one correspondence between critical temperatures of the system and kinks appearing in the temperature dependence of the chemical potential and average occupation numbers. This, in turn, indicates a possibility to apply the measurement of the chemical potential vs. temperature as an experimental universal tool when looking for phase transitions in solids.
Źródło:
Acta Physica Polonica A; 2000, 97, 4; 713-718
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Manifestation of Spin-Glass-Like Behavior in the Organometallic Magnet
Autorzy:
Dyakonov, V. P.
Arciszewska, M.
Dobrowolski, W.
Szewczyk, A.
Szymczak, H.
Aksymentieva, E.
Varyukhin, V.
Zubov, E.
Gutowska, M. U.
Powiązania:
https://bibliotekanauki.pl/articles/2013705.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
75.40.Cx
Opis:
Ac susceptibility (χ$\text{}_{ac}$) and dc magnetization (M$\text{}_{dc}$) of the organometallic magnet Na[FeO$\text{}_{6}$(C$\text{}_{10}$H$\text{}_{8}$N)$\text{}_{3}$] have been studied in temperature range of 4.2-200 K, in an external magnetic field up to 16 kOe. Some peculiarities of the χ$\text{}_{ac}$ and M $\text{}_{dc}$ behavior, which are characteristic of spin-glasses, e.g. cusps in the susceptibility and zero-field-cooled magnetization, an irreversibility between the field-cooled and zero-field-cooled magnetization and dependences of the T$\text{}_{cusp}$ temperature on the frequency and the intensity of the magnetic field, were observed at low temperatures.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 863-866
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Energy Spectrum and Thermodynamics of Spin-1/2 XX Chain with Ising Impurities
Autorzy:
Ezerskaya, E.
Powiązania:
https://bibliotekanauki.pl/articles/1032134.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Jm
75.40.Cx
Opis:
The energy spectrum and peculiarities of field and temperature dependences of the basic thermodynamic characteristics of the finite spin-1/2 XX chain closed by one zz (Ising) bond and open ends XX-chain with two zz-impurities at the both ends have been investigated.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 928-930
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transition from Mixed-Valence to Trivalent Cerium State in Ce(Ni,Cu)Al Series
Autorzy:
Čermák, P.
Javorský, P.
Šantavá, E.
Powiązania:
https://bibliotekanauki.pl/articles/1534620.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
75.30.Mb
Opis:
In this work we present the study of the part of Ce(Ni,Cu)Al series from the pure CeNiAl to 30% of copper concentration, which illustrates the transition from mixed-valence state of CeNiAl to the trivalent state in CeCuAl. The work is based on X-ray diffraction, magnetization and specific heat measurement. The results indicate smooth transition between the mixed-valence and trivalent cerium state. The specific-heat data reveal increase of the Sommerfeld γ coefficient with copper concentration.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 926-928
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetocaloric Effect in Geometrically Frustrated Magnetic Compound $HoB_{12}$
Autorzy:
Snyman, J.
Flachbart, K.
Gabani, S.
Reiffers, M.
Shitsevalova, N.
Siemensmeyer, K.
Strydom, A.
Powiązania:
https://bibliotekanauki.pl/articles/1534216.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.40.Cx
Opis:
The magnetocaloric effect of frustrated antiferromagnetic $HoB_{12}$ is calculated. The isothermal entropy change Δ S characterising the magnetocaloric effect shows a small positive change upon magnetisation below the transition temperature $T_{N}$, indicating a small inverse magnetocaloric effect. At $T_{N}$, Δ S shows clear scaling behaviour with the applied magnetic field. The adiabatic temperature change Δ T shows paramagnetic behaviour above $T_{N}$, despite strong magnetic correlations that persist in this temperature region. The adiabatic temperature change calculated for $HoB_{12}$ is appreciable.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 873-874
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zero Temperature Magnetic Frustration in Nona-Membered s=3/2 Spin Rings with Bond Defect
Autorzy:
Antkowiak, M.
Kozłowski, P.
Kamieniarz, G.
Powiązania:
https://bibliotekanauki.pl/articles/1427128.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
75.10.Jm
Opis:
Zero-temperature limits of the local and global thermodynamic quantities in the nine-membered antiferromagnetic s=3/2 spin ring are investigated by means of numerical exact diagonalization. An anisotropic Heisenberg model with tunable bond defect reflecting continuously varying topology (from closed to open ring) is exploited. The frustrated and non-frustrated phases are identified in the ground-state phase diagram determined by a bond-defect strength and magnetic field. Near the phase boundaries significance of the thermal fluctuations affecting the estimates of the local magnetic quantities found earlier at T=1 K is revealed. For the global quantities the effects of thermal fluctuations are found much weaker. A sequence of the local magnetic moments is analysed and their experimental verification at the edges of the non-frustrated and within the entire frustrated phase is suggested at sufficiently low temperature.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1102-1104
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
Tytuł:
Theoretical Study of Phase Diagrams for Reentrant Superconducting Er$\text{}_{1-x}$Ho$\text{}_{x}$X, Er$\text{}_{1-x}$Gd$\text{}_{x}$X, Er$\text{}_{1-x}$Tm$\text{}_{x}$X, Ho$\text{}_{x}$Lu$\text{}_{1-x}$X, and Sm$\text{}_{1-x}$Er$\text{}_{x}$X (X = Rh$\text{}_{4}$B$\text{}_{4}$) Alloys
Autorzy:
Gosławska, E.
Matlak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2013024.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
75.40.Cx
Opis:
We consider a simplified version of the s-f model, supplemented by the intersite Cooper pairs interaction between conduction electrons with opposite spins to investigate ferromagnetic and superconducting properties of an alloy Re$\text{}_{1-x}^{(1)}$Re$\text{}_{x}^{(2)}$X (Re$\text{}^{(1),(2)}$ - rare earth elements, X = Rh$\text{}_{4}$B$\text{}_{4}$) using the virtual crystal approximation. For a suitable choice of the model parameters we can reproduce the phase boundaries of the experimentally measured phase diagrams for Er$\text{}_{1-x}$Ho$\text{}_{x}$X, Er$\text{}_{1-x}$Gd$\text{}_{x}$ X, Er$\text{}_{1-x}$Tm$\text{}_{x}$X, Ho$\text{}_{x}$Lu$\text{}_{1-x}$X, and Sm$\text{}_{1-x}$Er$\text{}_{x}$X alloys.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 415-418
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific Heat and Magnetism of $LuFe_6Al_6$
Autorzy:
Svoboda, P.
Andreev, A.
Šantavá, E.
Šebek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1813662.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
65.40.Ba
Opis:
Here we present the results of the zero-field specific heat study of the $LuFe_6Al_6$ single crystal. The specific heat data were analyzed as a sum of the phonon, electronic, and magnetic contributions, respectively. The analysis of the phonon part involves three acoustic and 36 optical branches, respectively, all of them corrected for the anharmonicity. The magnetic part of the specific heat was obtained by subtracting the electronic and the phonon part from the experimental specific heat and the magnetic entropy was calculated.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 307-310
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lattice Heat Capacity in RTAl (R = Y, Lu;T = Ni, Cu, Pd) Compounds
Autorzy:
Daniel, P.
Javorský, P.
Prchal, J.
Daniš, S.
Šantavá, E.
Powiązania:
https://bibliotekanauki.pl/articles/1813674.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
65.40.Ba
75.40.Cx
Opis:
We present analysis of the specific heat of the RTAl (R = Y, Lu;T = Cu, Ni, Pd) compounds. We focus on the lattice contribution and analyze the dependence of all the characteristic parameters in the Debye and Einstein models on the atomic masses and interatomic distances.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 331-334
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Specific Heat of Pb$\text{}_{1-x}$Eu$\text{}_{x}$Te
Autorzy:
Górska, M.
Łusakowski, A.
Jędrzejczak, A.
Gołacki, Z.
Anderson, J. R.
Balci, H.
Powiązania:
https://bibliotekanauki.pl/articles/2038143.pdf
Data publikacji:
2004-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.-d
75.40.Cx
Opis:
The temperature dependence of the magnetic specific heat was studied experimentally and theoretically in the semimagnetic semiconductor Pb$\text{}_{1-x}$Eu$\text{}_{x}$Te for x=0.027 and x=0.073, over the temperature range from 0.5 K to 15 K, in magnetic fields up to 2 T. In zero magnetic field at about 2 K there was a broad maximum in the magnetic specific heat, which was much higher than that predicted by the model of superexchange interaction between nearest neighbors; the maximum values increased with magnetic field. The experimental data were analyzed in the framework of a model which takes into account the spin splitting of the ground state of a single Eu2+ ion in the presence of local lattice distortions in the Pb$\text{}_{1-x}$Eu$\text{}_{x}$Te mixed crystal. The model describes well the experimental data, especially for lower x-values, where the contribution from singlets dominates.
Źródło:
Acta Physica Polonica A; 2004, 105, 6; 631-636
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific Heat of the Mixed Spin-1/2 and Spin-S Ising Model with a Rope Ladder Structure
Autorzy:
Kiššová, J.
Strečka, J.
Powiązania:
https://bibliotekanauki.pl/articles/1813792.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.50.+q
75.40.Cx
Opis:
The mixed spin-1/2 and spin-S (S>1/2) Ising model on a rope ladder is examined by combining two exact analytical methods. By the decoration-iteration mapping transformation, this mixed-spin system is firstly transformed to a simple spin-1/2 Ising model on the two-leg ladder, which is then exactly solved by the standard transfer-matrix method. The thermal variations of the zero-field specific heat are discussed in particular.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 445-448
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Temperature Anomalies in the Specific Heat and Magnetic Susceptibility of $Na_{0.7}CoO_2$ Samples
Autorzy:
Baran, A.
Zorkovská, A.
Feher, A.
Šebek, J.
Šantavá, E.
Hejtmánek, J.
Veverka, M.
Bradarić, I.
Ružička, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813849.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
72.80.Ga
Opis:
We present a comparative study of $Na_{0.7}CoO_2$ samples obtained from three different sources and prepared by different methods. The specific heat and magnetic susceptibility measurements in the temperature range 2-300 K show substantial influence on the observed anomalies, which underlines that the system is extremely sensitive to preparation protocols.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 495-498
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 94

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