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    Wyświetlanie 1-11 z 11
    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
    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
    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:
    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:
    Experimental Studies of S=1 Heisenberg Planar Antiferromagnetic Chain Ni(C$\text{}_{11}$H$\text{}_{10}$N$\text{}_{2}$O)$\text{}_{2}$Ni(CN)$\text{}_{4}$
    Autorzy:
    Čizmár, E.
    Černák, J.
    Orendáč, M.
    Herrmannsdörfer, T.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013230.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    71.20.Be
    75.50.Ee
    Opis:
    In this paper we discuss the results of experimental studies of specific heat and magnetic susceptibility of chain compound Ni(C$\text{}_{11}$H$\text{}_{10}$N$\text{}_{2}$O)$\text{}_{2}$Ni(CN)$\text{}_{4}$. We have observed a Schottky type anomaly at T=2.2 K in a temperature dependence of specific heat and the compound was identified as a S=1 Heisenberg antiferromagnetic chain with the subcritical exchange coupling D/k$\text{}_{B}$=5 K, D/|J|=5.2 and the strong in-plane anisotropy E/k$\text{}_{B}$=2.8 K. It has been found that the in-plane anisotropy affects the region of validity of a diluted exciton model [1] and a strong coupling model [2] for S=1 Heisenberg chains with the strong planar anisotropy. The analysis suggests that the in-plane anisotropy should be considered in any attempt to find a compound potentially located in the boundary of Haldane and "large-D" phases.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 579-582
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    KEr(MoO$\text{}_{4}$)$\text{}_{2}$ and CsDy(MoO$\text{}_{4}$)$\text{}_{2}$ - Low-Dimensional Ising Magnets
    Autorzy:
    Kačmár, M.
    Orendáčová, A.
    Čizmár, E.
    Horváth, D.
    Orendáč, M.
    Bondarenko, V.
    Anders, A. G.
    Feher, A.
    Jaščur, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013657.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    75.10.Hk
    75.40.Mg
    Opis:
    In the present work the behaviour of cluster excitations in magnetic field, B, parallel to the easy axis was experimentally studied by the measurements of KEr(MoO$\text{}_{4}$)$\text{}_{2}$ and CsDy(MoO$\text{}_{4}$)$\text{}_{2}$ specific heat, C, vs. B dependence studied at a constant temperature. Corresponding Monte Carlo simulations of C revealed that despite of the fact that the Ising exchange-coupling models proved useful for a sufficient description of the specific heat of these dipolar systems in B=0, the analysis of current experimental data requires a partial renormalization of exchange-coupling constants previously obtained from B=0 analysis. The influence of crystal field effects and long-range character of spin correlations is discussed.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 807-810
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of magneto-structural correlations in low-dimensional quantum magnets Cu(en)Cl₂ and Cu(tn)Cl₂
    Autorzy:
    Tarasenko, R.
    Lederová, L.
    Orendáčová, A.
    Orendáč, M.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1048202.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.-m
    75.50.Ee
    75.40.-s
    75.40.Cx
    Opis:
    The present work is focused on the investigation of magneto-structural correlations in Cu(en)Cl₂ and Cu(tn)Cl₂. A comparative study of powder susceptibility and magnetization of both compounds revealed that the replacement of tn by en ligand did not affect single-ion properties. On the other hand, the structure modification led to significant reduction of magnetic interactions as well as lowering the crystal symmetry. The impact of the high pressure on magnetic properties of the compounds is discussed.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 420-422
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scattering of Phonons in $CsMnCl_3 \cdot 2H_2O$
    Autorzy:
    Tkáč, V.
    Tibenská, K.
    Orendáčová, A.
    Orendáč, M.
    Šebek, J.
    Sechovský, V.
    Anders, A.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534857.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Et
    75.40.Cx
    66.70.Lm
    75.30.Ds
    Opis:
    The thermal conductivity of the quasi-one-dimensional S = 5/2 Heisenberg antiferromagnet $CsMnCl_3 \cdot 2H_2O$ with the intrachain interaction $J//k_{B}$ = 3 K was experimentally studied at temperatures from 2 to 25 K. The data analysis performed within the Debye model with the relaxation-time approximation unambiguously indicates the presence of the scattering of phonons on magnetic subsystem.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 950-952
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Conductivity of a Layered $CsGd(MoO_4)_2$ Crystal
    Autorzy:
    Tibenská, K.
    Tkáč, V.
    Orendáčová, A.
    Orendáč, M.
    Feher, A.
    Šebek, J.
    Sechovský, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534983.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Et
    75.40.Cx
    66.70.Lm
    75.30.Ds
    Opis:
    The thermal conductivity of $CsGd(MoO_4)_2$ has been studied in the temperature range from 2 to 50 K in zero magnetic field. The analysis of the data performed within the Debye model with the relaxation-time approximation revealed the presence of the scattering of phonons by critical fluctuations. The behaviour of phonon mean free path at the lowest temperatures is discussed.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 971-972
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Study of the Thermal Transport in $CsNiF_3 - An S = 1$ Quantum Chain
    Autorzy:
    Tkáč, V.
    Orendáčová, A.
    Orendáč, M.
    Legut, D.
    Tibenská, K.
    Feher, A.
    Poirier, M.
    Meisel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427127.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Et
    75.40.Cx
    66.70.Lm
    75.30.Ds
    Opis:
    The heat transport in a single-crystal of $CsNiF_3$ has been performed in the temperature range from 2 K to 7 K in a zero magnetic field, B = 0, as well as in sufficiently large magnetic fields, B = 6 T and 9 T, inducing the ferromagnetic ground state along the hard c-axis. $CsNiF_3$ represents an S = 1 quasi-one-dimensional XY ferromagnet with the intra-chain exchange coupling $J//k_{B}$ ≈ 24 K, single-ion anisotropy $D/k_{B}$ ≈ 8 K, and ordering temperature $T_{N}$ = 2.7 K. Comparison of the phonon and magnon velocities suggests that phonons are the main heat carriers in this magnetic insulator. The thermal conductivity in B = 0 was analysed in the frame of a standard Debye model. The temperature dependence of the effective phonon mean free path was calculated from the experimental data, and the enhancement of the phonon mean free path in B ≠ 0 was obtained, indicating that magnons act as scattering centers for phonons.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1098-1101
    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
      Wyświetlanie 1-11 z 11

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