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    Wyświetlanie 1-14 z 14
    Tytuł:
    $[Ni(en)(H_2O)_4][SO_4] \cdot 2H_2O$ - an S = 1 Molecular Magnet with Easy-Plane Anisotropy
    Autorzy:
    Tarasenko, R.
    Orendáčová, A.
    Tibenská, K.
    Potočňák, I.
    Kajňaková, M.
    Vlček, A.
    Orendáč, M.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813818.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Et
    75.30.Gw
    75.40.Cx
    Opis:
    Structural analysis of $[Ni(en)(H_2O)_4][SO_4] \cdot 2H_2O$ was performed and it suggests that the crystal field should play a dominant role in the magnetic properties of the system. This conjecture coincides well with the specific heat and susceptibility behaviour. The analysis confirmed that the compound can be treated as a spin 1 single molecule magnet with nonmagnetic ground state introduced by easy-plane single-ion anisotropy D/$k_B$≈11 K and neglecting in-plane anisotropy E/D <0.1.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 481-484
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    $CuBr_2(C_{10}H_8N_2) - S = 1//2$ Two-Dimensional Rectangular Heisenberg Antiferromagnet
    Autorzy:
    Čižmár, E.
    Kajňaková, M.
    Orendáčová, A.
    Orendáč, M.
    Feher, A.
    Anders, A.
    Park, J.
    Meisel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534990.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Et
    75.50.Ee
    76.30.-v
    Opis:
    Magnetic susceptibility and X-band electron spin resonance study of a two-dimensional Heisenberg antiferromagnetic system $CuBr_2$(bipy), where bipy = $C_{10}H_8N_2$ is 4,4'-bipyridyl, has been performed in the temperature range from 300 K down to 2 K. A rhombic anisotropy of the g-factor was obtained from X-band EPR measurements with $g_{x}$ = 2.037, $g_{y}$ = 2.100 and $g_{z}$ = 2.219. The temperature dependence of the magnetic susceptibility with a round maximum observed at 28 K suggests antiferromagnetic type of short-range order. No signature of the magnetic long-range order in studied compound was observed. The comparison of the magnetic susceptibility data with a two-dimensional rectangular Heisenberg model yields the values of intralayer exchange couplings J/$k_{B}$ = - 47 K and J'/$k_{B}$ = - 9.4 K.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 973-974
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR Spectra of the Genuine-Organic and Metal-Organic TCNQ-Based Anion Radical Salts
    Autorzy:
    Botko, M.
    Čižmár, E.
    Kajňaková, M.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368637.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Xx
    76.30.-v
    Opis:
    We have measured the electron paramagnetic resonance spectra of genuine-organic anion-radical salts $[Me-2,6-di-Me-Py](TCNQ)_{2}$, $[Me-3,5-di-Me-Py](TCNQ)_{2}$, $[N-Me-OH-Me-Py](TCNQ)_{2}$, $[N-Et-OH-Me-Py](TCNQ)_{2}$, and metal-organic anion-radical salt $[Mn-phen_{3}](TCNQ)_{2}$·$H_{2}O$ in the temperature range from 2 K to 300 K in the X-band frequency range. A comparison study of the shape of spectra, g-factors and linewidths with respect to the composition and crystal structure of studied compounds is presented. While the genuine-organic anion-radical salts display a typical EPR response originating from TCNQ pairs, the spectra of metal-organic anion-radical salt are dominated by the contribution of transition metal.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 252-253
    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:
    Experimental Study of Magnetocaloric Effect in Dipolar Magnet $KEr(MoO_4)_2$
    Autorzy:
    Hanko, J.
    Orendáč, M.
    Kajňaková, M.
    Orendáčová, A.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813812.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    75.50.Ee
    Opis:
    We report on magnetothermodynamic properties of single crystal $KEr(MoO_4)_2$ which were investigated from nominally 0.4 K to 20 K in magnetic fields up to 4 T. Using the available specific heat data the diagram of temperature and magnetic field dependence of the total entropy was constructed. Predictions for temperature dependences of the relative temperature variations during the adiabatic demagnetization and the entropy variation during the isothermal demagnetization were calculated from the specific heat data. The obtained results suggest that unlike common refrigerants, in $KEr(MoO_4)_2$ the quantities describing magnetic cooling remain nearly constant in the temperature range 2-10 K.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 465-468
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferroelastic Phase Transition in a Layered Bismuth Oxychloride Single Crystals
    Autorzy:
    Bunda, V.
    Bunda, S.
    Vashchuk, F.
    Feher, A.
    Kajňaková, M.
    Kováč, J.
    Syrkin, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535538.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.K-
    81.30.-t
    65.40.-b
    Opis:
    We report the results of low-temperature specific-heat, magnetization, and X-ray diffraction measurements on a bismuth oxyhalide (BiOCl) single crystal. We conclude that BiOCl in temperature region 150-230 K shows "antiferroelastic-paraelectric" phase transitions at critical temperatures $T_{c1}$ = 167.5 K and $T_{c2}$ = 214.6 K, respectively.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 1069-1070
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low Temperature Specific Heat of BiOX (X = Cl, Br, and I) Single Crystals
    Autorzy:
    Bunda, V.
    Bunda, S.
    Kajňakova, M.
    Feher, A.
    Syrkin, E.
    Feodosyev, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535050.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.-b
    63.22.Np
    Opis:
    Low temperature specific heat of layered bismuth oxyhalide crystals has been studied in the temperature range from 2 to 50 K in zero and 8 T magnetic field. The expected Debye-like behaviour at the lowest temperatures (below 4-5 K) is established. Linear dependences of entropy and the Debye temperature as cross-correlation parameters are established. The small values of the Debye temperature and peculiarities of phonon spectra at lowest temperatures are discussed.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 986-987
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of an S=2 Ladder Spin Model Applied to a New Quasi-One-Dimensional Magnet $[Mn(phen)_{3}](TCNQ)_{2}·H_{2}O$
    Autorzy:
    Botko, M.
    Cheranovskii, V.
    Vasilets, G.
    Čižmar, E.
    Kajňaková, M.
    Anders, A.
    Starodub, V.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366461.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Xx
    75.10.Jm
    76.10.Pq
    Opis:
    The effective spin S=2 Heisenberg ladder model with free-spin admixtures was proposed for the study of the low-temperature magnetic properties of the complex compound $[Mn(phen)_{3}](TCNQ)_{2}·H_{2}O$. The temperature dependence of magnetic susceptibility was found to be close to experimental data.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 20-21
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Anion-Radical Salts Based on TCNQ Anion Radical
    Autorzy:
    Radváková, A.
    Kajňaková, M.
    Feher, A.
    Ziolkovskiy, D.
    Starodub, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813852.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ee
    75.30.Et
    75.40.Cx
    71.70.Gm
    72.80.Le
    Opis:
    We report the experimental results of anion-radical salts based on TCNQ anion radical. DC magnetic susceptibility measurements in the temperature range from 2 K to 300 K and magnetization measurements were performed on two samples: (N-Me-2, 5-di-Me-Pz)$(TCNQ)_2$ and (N-Me-2, 6-di-Me-Pz)$(TCNQ)_2$ using a Quantum Design MPMS.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 499-502
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magneto-Structural Correlations in $Cu(en)_2SO_4$ - a new Magnet with Two-Dimensional Triangular Arrangement of Cu(II) ions
    Autorzy:
    Kajňaková, M.
    Orendáčová, A.
    Orendáč, M.
    Feher, A.
    Mal'arová, M.
    Trávníček, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813857.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.40.-s
    75.30.Et
    75.50.Ee
    Opis:
    $Cu(en)_2SO_4$ (en = 1, 2-diaminoethane) was synthesized and its crystal structure determined. From a crystallographic point of view, the compound might represent an example for the realization of a S =1/2 Heisenberg magnet on a two-dimensional spatially anisotropic triangular lattice. Magnetic susceptibility and magnetization studies were performed to analyze the magneto-structural correlations and to characterize the magnetic subsystem of the present compound. The results indicate the presence of antiferromagnetic interactions between magnetic ions with zJ/$k_B$≈-14.6 K and short-range order near 7 K.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 507-510
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetocaloric Study of S=1/2 Low-Dimensional Heisenberg Antiferromagnet $[Cu\text{(phen)}(H_2O)_2]SO_4$
    Autorzy:
    Sedláková, L.
    Orendáč, M.
    Kajňaková, M.
    Orendáčová, A.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813815.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    75.50.Ee
    Opis:
    We present the experimental study of magnetocaloric effect on powder sample $[Cu\text{(phen)}(H_2O)_2]SO_4$ (phen = phenantroline = $C_{12}H_8N_2$) in the temperature range from nominally 0.2 K to 4 K and in magnetic fields up to 2 T. The values of total entropy were extracted from the experimental data obtained by adiabatic demagnetization. The comparison was performed with the temperature dependence of the entropy for S=1/2 paramagnet calculated at selected magnetic fields. The deviations observed below 0.6 T were attributed to internal field mediated by exchange coupling. In addition, the temperature response observed in $[Cu\text{(phen)}(H_2O)_2]SO_4$ revealed very short relaxation time below 1 K. The comparison of the behavior observed at the end of the demagnetization in $[Cu\text{(phen)}(H_2O)_2]SO_4$ and other systems suggests that the magnetocaloric effect can serve as an alternative tool for studying slow magnetic relaxation.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 473-476
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin-Peierls Transition in $(N-Me-Tetra-Me-Pz)(TCNQ)_{2}$
    Autorzy:
    Kajňaková, M.
    Botko, M.
    Starodub, V.
    Čižmár, E.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368650.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.60.i
    75.10.Jm
    75.50.Xx
    76.30.v
    Opis:
    The new organic anion-radical salt $(N-Me-Tetra-Me-Pz)(TCNQ)_{2}$, (Pz = pyrazine) was studied as a low dimensional magnetic system. Heat capacity and EPR studies were performed in the temperature range from 2 to 300 K. The magnetic susceptibility was measured in the temperature range from 2 to 300 K and in magnetic fields of 100 mT and 1 T. The magnetic properties of this new system can be described as a dimerized Heisenberg spin S=1/2 chain possessing a spin-Peierls transition at 42 K.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 254-255
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic and Magnetotransport Properties of High Quality $Na_{0.77}CoO_{2}$ Single Crystals
    Autorzy:
    Baran, A.
    Zorkovská, A.
    Kajňaková, M.
    Lin, C.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371577.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Hr
    75.40.Cx
    75.47.-m
    Opis:
    Heat capacity and electrical resistivity of high-quality $Na_{0.77}CoO_{2}$ single crystals was systematically studied as a function of temperature and magnetic field. Anomalies at 20 K have been observed both in the heat capacity and the electrical resistivity. The broad bump in the heat capacity indicates a smeared magnetic phase transition. Magnetic fields up to 9 T, oriented perpendicularly to the ab plane, reduce the temperature of this anomaly in accordance with the assumption of A-type antiferromagnetic ordering. The low temperature upturn observed in resistivity below 20 K for slow cooling is also suppressed by the magnetic field. This anomaly is probably the consequence of the interplay of several different mechanisms, including the Kondo effect, electron-electron interactions, and electron-phonon scattering.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 360-361
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ti-Induced Ferromagnetism and the Specific Heat of $CaTi_xRu_{1-x}O_3$ (x=0, 0.005, 0.03)
    Autorzy:
    Zorkovská, A.
    Baran, A.
    Kajňaková, M.
    Feher, A.
    Šebek, J.
    Šantavá, E.
    Bradarić, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813685.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Pq
    75.40.Cx
    72.80.Ga
    Opis:
    The influence of Ti substitution on the specific heat of the $CaTi_xRu_{1-x}O_3$ system at low concentrations x=0, 0.005, and 0.03 was studied in the temperature range of 2-300 K at magnetic fields up to 9 T. Small peak was revealed in the C/T vs. $T^2$ dependence at around 3 K, which are field sensitive (the electronic specific heat coefficient γlinearly decreases with the increase in magnetic field), and might be connected to some kind of magnetic ordering. The coefficient γis suppressed also by Ti substitution.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 355-358
    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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