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Wyświetlanie 1-15 z 38
Tytuł:
Anomalies of Heat Capacity and Phase Transitions in $Tm_{1-x}Yb_{x}B_{12}$
Autorzy:
Sluchanko, N.
Azarevich, A.
Bogach, A.
Glushkov, V.
Demishev, S.
Gavrilkin, S.
Shitsevalova, N.
Fillipov, V.
Gabani, S.
Flachbart, K.
Powiązania:
https://bibliotekanauki.pl/articles/1534651.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.-s
Opis:
In the system $Tm_{1 - x}Yb_{x}B_{12}$ the specific heat has been studied in a wide range of Yb-concentration in the vicinity of the quantum critical point $x_{C}$ ≈ 0.3. The results were obtained on high quality single crystalline samples of $Tm_{0.7}Yb_{0.3}B_{12}$ compound placed near quantum critical point, both for antiferromagnetic metals (x < $x_{C}$) as well as for paramagnetic insulators (x > $x_{C}$) within a wide temperature range of 1.9-300 K in magnetic field up to 9 T. The temperature dependence of the magnetic contribution to specific heat for $Tm_{0.74}Yb_{0.26}B_{12}$ shows a logarithmic divergence of the form $C_{mag}$/T∿-lnT at T<4 K, which may be attributed to the quantum critical regime, and it is suppressed by strong external magnetic field. The Schottky anomaly of the magnetic contribution to specific heat in $Tm_{1 - x}Yb_{x}B_{12}$ has been established and analyzed in detail.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 929-930
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synchrotron Radiation Diffraction Studies of Magnetic Materials
Autorzy:
Brückel, Th.
Powiązania:
https://bibliotekanauki.pl/articles/1963318.pdf
Data publikacji:
1997-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.25.+z
75.40.-s
Opis:
Since the advent of high brilliance synchrotron radiation sources, magnetic X-ray diffraction has become a standard microscopic probe for the investigation of magnetic structures, magnetic phase transitions and magnetic disorder phenomena. Modern experiments highlight the complementarity of this new probe to the standard neutron diffraction technique by taking advantage of the high momentum space resolution, the element sensitivity, the possibility to separate spin- and orbital contributions etc. In this paper we present selected experiments performed at HASYLAB which exemplify the present possibilities of resonant and non-resonant magnetic X-ray diffraction.
Źródło:
Acta Physica Polonica A; 1997, 91, 4; 669-679
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR Study of the Two-Dimensional Quantum System $Cu(en)(H_2O)_2SO_4$
Autorzy:
Tarasenko, R.
Orendáčová, A.
Čižmár, E.
Orendáč, M.
Zvyagin, S.
Wosnitza, J.
Powiązania:
https://bibliotekanauki.pl/articles/1427109.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
75.40.-s
Opis:
The angular dependence of electron paramagnetic resonance spectra of $Cu(en)(H_2O)_2SO_4$ single crystals was studied in the X-band frequency range at temperatures 4 and 300 K. Analysis of the linewidth at 300 K revealed nice agreement with the angular variation of the g-factor. This coincidence is the manifestation of the symmetric and antisymmetric exchange coupling, as main broadening mechanisms in $Cu(en)(H_2O)_2SO_4$ at high temperatures. The radical change of the angular dependence of the linewidth observed at 4 K can be ascribed to dipolar coupling.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1095-1097
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Rare-earth Based Single-ion Magnet $CsNd(MoO_{4})_{2}$
Autorzy:
Tkáč, V.
Tibenská, K.
Orendáčová, A.
Orendáč, M.
Anders, A.
Pavlík, V.
Feher, A.
Powiązania:
https://bibliotekanauki.pl/articles/1368610.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.-s
75.60.-d
Opis:
Specific heat, magnetization and DC susceptibility of the single crystal $CsNd(MoO_{4})_{2}$,a layered rare-earth dimolybdate, have been investigated nominally, in the temperature range from 100 mK to 300 K in the magnetic field up to 5 T, applied along the a axis. The analysis of the experimental data revealed the absence of a phase transition to the magnetic ordered state down to 100 mK. The application of a standard two-level model yielded an excellent agreement with the specific heat data above 2 K in nonzero magnetic field indicating a weakness of magnetic correlations and a predominant occupation of the ground-energy doublet. The latter indicates a large energy separation between the ground and first excited doublet. These measurements suggest that $CsNd(MoO_{4})_{2}$ can represent a good realization of a single-ion magnet.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 244-245
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Specific Heat of (Cd$\text{}_{1-x-y}$Zn$\text{}_{y}$Mn$\text{}_{x}$)$\text{}_{3}$As$\text{}_{2}$
Autorzy:
Bednarski, H.
Cisowski, J.
Schmitt, D.
Voiron, J.
Portal, J. C.
Lubczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/1929727.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.-s
75.30.Et
Opis:
The specific heat of (Cd$\text{}_{1-x-y}$Zn$\text{}_{y}$Mn$\text{}_{x}$)$\text{}_{3}$As$\text{}_{2}$ with low Mn concentration (x ≤ 0.067) and for two Zn contents (y = 0.14 and y = 0.34) has been measured in the temperature range of 1.5-30 K. The magnetic contribution to the total specific heat has been analysed within our generalized pair approximation model which takes into account the complicated tetragonal crystal structure of Cd$\text{}_{1-x-y}$Zn$\text{}_{y}$Mn$\text{}_{x}$)$\text{}_{3}$As$\text{}_{2}$. Assuming that the total Mn-Mn interaction strength is a sum of superexchange and the Bloembergen-Rowland exchange, we have obtained a very good agreement between our approach and experiment by using the analytical formulae with only two adjustable parameters, i.e. the first nearest-neighbour exchange constants for both mechanisms which appear to be strongly dependent on Zn content.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 705-708
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific Heat of RBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-x}$ and RBaSrCu$\text{}_{3}$O$\text{}_{7-x}$ Compounds (R = Sm, Dy, Er)
Autorzy:
Tarnawski, Z.
Kim-Ngan, N.-T. H.
Wang, X. Z.
Duijn, V. H. M.
Franse, J. J. M.
Powiązania:
https://bibliotekanauki.pl/articles/1968860.pdf
Data publikacji:
1998-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.-b
75.40.-s
Opis:
The low-temperature specific-heat C(T) data of high-T$\text{}_{c}$ superconductors RBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-x}$(R123O$\text{}_{7-x}$) were reviewed. A discussion of the C(T) data obtained on single-crystalline samples of Er123O$\text{}_{7-x}$ and Sm123O$\text{}_{7-x}$ compounds in applied magnetic fields for better evaluation of the crystal-electric-field parameters is given. The C(T) measurements of Sr-substituted compounds RBaSrCu$\text{}_{3}$O$\text{}_{7}$ revealed the λ-type of peak related to the antiferromagnetic order at 1.2 K and 0.6 K respectively for Dy- and Er-compounds. The magnetic singlet ground state in these compounds is produced by weak exchange interactions of -0.05 T/μ$\text{}_{B}$ and -0.035 T/μ$\text{}_{B}$, respectively. For Nd- and Sm-compounds, only a broad anomaly around 0.6 K was observed which is well fitted with a Schottky-type anomaly with an energy splitting of 1.4 K.
Źródło:
Acta Physica Polonica A; 1998, 93, 3; 513-522
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic X-Ray Scattering
Autorzy:
Vettier, C.
Powiązania:
https://bibliotekanauki.pl/articles/1931650.pdf
Data publikacji:
1994-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.25.+z
75.40.-s
61.10.Dp
Opis:
It was proposed in the 1950's that X-rays could be used to probe magnetization densities. After some experimental demonstrations of the technique, applications have shown that the use of magnetic X-ray scattering combined with synchrotron radiation can lead to important new discoveries in the magnetism of solid materials. Several important features have emerged, especially the resonant magnetic X-ray scattering: large enhancements of scattered intensities, site and species selectivity, X-ray energy and polarization dependence. These properties make it possible to study new phenomena: details of magnetic structures of materials including micro-crystals, new aspects of magnetic phase transitions and surface magnetism.
Źródło:
Acta Physica Polonica A; 1994, 86, 4; 521-535
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical properties study of the CeOsGa₄ compound
Autorzy:
Sondezi, B.
Strydom, A.
Powiązania:
https://bibliotekanauki.pl/articles/1047645.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ee
75.50.Cc
75.40.-s
Opis:
A polycrystalline sample of CeOsGa₄ was prepared by arc-melting stoichiometric quantities of high purity elements of 4N and greater, in an arc furnace. The data was confirmed to crystallize in an orthorhombic structure, with a space group Pmma (Number 51). Measurements of the magnetic susceptibility showed a distinct anomaly around T_{o} = 3.8 K, while the high temperature data (above 100 K) obeys Curie-Weiss law. The calculated effective moment of 2.44 μ_{B}, was obtained, which was a bit less than the theoretical moment for a Ce³⁺ ion of 2.54 μ_{B}. Magnetization data at T=2 K depicts that CeOsGa₄ does not saturate up to applied magnetic field of 7 T, while the data measured at 9 K indicates that the compound is purely paramagnetic at that temperature. The low temperature specific heat data is characterized by an anomaly at T_{o} = 3.8 K confirming the χ(T) data. Electrical resistivity shows a metallic behaviour at high temperatures with a deviation at low temperatures, signalling the cooperative behaviour which results to ordering. In this work we present the initial studies of the physical properties measurements performed on this compound.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 398-400
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific Heat of the $Tb_{1-x}La_xNi_2$ Solid Solutions
Autorzy:
Ćwik, J.
Palewski, T.
Nenkov, K.
Powiązania:
https://bibliotekanauki.pl/articles/1813679.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.40.-s
74.70.Ad
Opis:
Specific heat measurements have been performed on the polycrystalline $TbNi_2, LaNi_2$ and their solid solutions $Tb_{1-x}La_xNi_2$ (x=0.2, 0.3). The Debye temperatures, phonon and conduction electron contributions as well as the magnetic part of the heat capacity were determined and discussed. The magnetocaloric effect was estimated from measurements performed in a magnetic field of 0.42 T for $TbNi_2,$ $Tb_{0.8}La_{0.2}Ni_2$ and $Tb_{0.7}La_{0.3}Ni_2$.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 343-346
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of $RSn_{2}$ (R = Tb, Dy) Compounds
Autorzy:
Szytuła, A.
Kaczorowski, D.
Gondek, Ł.
Czub, J.
Nenkov, K.
Powiązania:
https://bibliotekanauki.pl/articles/1538313.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.-s
75.30.Kz
72.15.Eb
Opis:
Polycrystalline samples of $TbSn_{2}$ and $DySn_{2}$ were studied by means of magnetic susceptibility, electrical resistivity and heat capacity measurements. Both compounds have been found to order antiferromagnetically at low temperatures with some extra features in the ordered state due to changes in their magnetic structures. The two stannides exhibit metallic conductivity. The estimated crystal field levels splitting of $Tb^{3+}$ and $Dy^{3+}$ ground multiplets do not exceed 75 K.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 586-589
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperfine Interactions and Spin Correlations in ErT$\text{}_{2}$Sn$\text{}_{2}$ (T = Ni, Cu) Phases
Autorzy:
Görlich, E. A.
Kmieć, R.
Powiązania:
https://bibliotekanauki.pl/articles/1931249.pdf
Data publikacji:
1994-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Eb
75.40.-s
76.80.+y
Opis:
The present work reports on the electrical resistivity measurements and $\text{}^{119}$Sn Mößbauer effect investigations of the hyperfine interactions in novel ternary compounds ErNi$\text{}_{2}$Sn$\text{}_{2}$ and ErCu$\text{}_{2}$Sn$\text{}_{2}$. The attention was focused on the temperature region of the magnetic ordering transitions, i.e. at T$\text{}_{N}$ = 5 K and 3.5 K, respectively. Er$\text{}^{3+}$ spin correlations in ErNi$\text{}_{2}$Sn$\text{}_{2}$ are discussed in terms of their influence on resonant γ-absorption.
Źródło:
Acta Physica Polonica A; 1994, 85, 3; 627-632
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of the Verwey Transition in Magnetite
Autorzy:
Tarnawski, Z.
Wiecheć, A.
Madej, M.
Nowak, D.
Owoc, D.
Król, G.
Kąkol, Z.
Kolwicz-Chodak, L.
KozŁowski, A.
Dawid, T.
Powiązania:
https://bibliotekanauki.pl/articles/2041527.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.18.Bn
75.40.-s
71.20.Lp
Opis:
Studies of the specific heat and simultaneous AC magnetic susceptibility (ρ') and electric resistance of stoichiometric magnetite single crystal are presented. The temperature hysteresis of the Verwey transition is of 0.03 K found from the specific heat data confirming its first-order character. The continuous temporal change of ρ' at T$\text{}_{V}$ can be switched off by an external magnetic field without affecting the transition. The electrical resistance decreases continuously with increasing temperature with a rapid change of slope at the point when the phase transition is completed. It was concluded that the magnetic degrees of freedom do not actively participate in the transition and that the entropy released at T$\text{}_{V}$ may come from ordering electrons.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 771-775
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Study of Magnetic Properties of Alumina Ceramics
Autorzy:
Tarasenko, R.
Orendáčová, A.
Orendáč, M.
Kajňaková, M.
Feher, A.
Powiązania:
https://bibliotekanauki.pl/articles/1535536.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.-g
75.60.Ej
75.40.-s
Opis:
Magnetic properties of alumina ceramics were studied within a program focused at design of microcalorimeters and experimental setup for specific heat and magnetocaloric measurements. The investigations were concentrated on the determination of amount of magnetic impurities that can significantly influence results of physical measurements at low temperatures. Our experimental studies of heat capacity, susceptibility and magnetization clearly indicate that alumina ceramics contains magnetic impurities, primarily ions with spin 5/2. The average concentration of magnetic ions was estimated, n ≈ 2000 ppm. More details of analysis of experimental data are discussed in the paper.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 1067-1068
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasicritical Behaviour of the NMR and µSR Relaxation in YMn$\text{}_{2}$D$\text{}_{x}$
Autorzy:
Paja, A.
Mietniowski, P.
Figiel, H.
Powiązania:
https://bibliotekanauki.pl/articles/2013711.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.-s
76.60.-k
76.75.+i
Opis:
The magnetic and structural properties of YMn$\text{}_{2}$ are strongly influenced by introduction of hydrogen (deuterium) in the structure, however, it only slightly modifies the noncollinear antiferromagnetic structure of the compound. The temperature dependences of the NMR relaxation times T$\text{}_{1}$ and T$\text{}_{2}$ of deuterium and the zero-field relaxation of muons in YMn$\text{}_{2}$D$\text{}_{x}$ were measured at temperatures above the magnetic ordering temperature T$\text{}_{N}$. The corresponding relaxation rates are described by the empirical expression (T/T$\text{}_{N}$-1)$\text{}^{-η}$, where the exponent η increases linearly with deuterium concentration x. To explain this behaviour, the Moriya theory of spin fluctuations was used. The expressions for NMR and μSR relaxation rates have been calculated. The resultant formulae agree well with the experiment, giving reasonable values of fitting parameters. The results obtained are discussed in terms of spin fluctuation excitation spectrum.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 867-870
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport Properties of $CeCo_{12}B_6$ in Vicinity of Phase Transition
Autorzy:
Skorokhod, Y.
Arnold, Z.
Míšek, M.
Kamarád, J.
Isnard, O.
Mayot, H.
Powiązania:
https://bibliotekanauki.pl/articles/1813635.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
75.40.-s
72.15.Eb
Opis:
Study of resistivity and specific heat on $CeCo_{12}B_6$ compound was performed in a temperature range 2.5-300 K. The specific heat exhibits pronounced λ-type anomaly in the vicinity of the Curie temperature $T_C$. Using the Debye-Einstein model the following parameters were obtained: the Debye temperature $θ_D$ = 185 K, coefficient of the electron specific heat $γ_{el}$ = 115 mJ/mol K. The parabolic temperature dependence of resistivity ρ(T) = $ρ_0 + A_ρT^2$ was observed below $T_C$ in agreement with ferromagnetic state. Comparison of dρ/dT(T) with $C_M(T)$ allows to confirm their similar character, accordingly to theory of critical behavior.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 259-262
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 38

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