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    Wyświetlanie 1-9 z 9
    Tytuł:
    Slow Magnetic Relaxation in the Highly Anisotropic Layered Crystal CsNd(MoO₄)₂
    Autorzy:
    Tkáč, V.
    Orendáčová, A.
    Tarasenko, R.
    Orendáč, M.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030440.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.Es
    76.30.Kg
    75.30.Gw
    75.40.Gb
    Opis:
    The present work is devoted to the magnetic relaxation study of the single crystal CsNd(MoO₄)₂ a layered rare-earth dimolybdate. AC susceptibility measurements performed in magnetic fields up to B=5 T applied along the easy and hard axis with frequency f ≈1 kHz revealed rather complex field-induced slow magnetic relaxation. Two relaxation regimes in different magnetic field intervals connected with magnetic interactions and possible single-ion relaxation mechanism were observed.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 466-469
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetocaloric effect in CsDy(MoO₄)₂
    Autorzy:
    Tarasenko, R.
    Tkáč, V.
    Orendáčová, A.
    Orendáč, M.
    Sechovský, V.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1050647.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    75.30.Gw
    71.70.Ej
    Opis:
    CsDy(MoO₄)₂ belongs to the family of binary alkaline rare-earth molybdates, with detectable low-temperature structural phase transitions, caused by the cooperative Jahn-Teller effect. Magnetocaloric studies of a single crystal of CsDy(MoO₄)₂ have been performed in the temperature range from 2 K to 18 K in magnetic fields up to 7 T applied along the crystallographic a axis. The maximum value of the isothermal entropy change is about 8 J/(kgK) and was achieved already in the fields above 2 T. The observed results suggest that the studied system can be used as a magnetic refrigerant at helium temperatures.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 414-416
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic-Field Induced Slow Relaxation in the Ising-Like Quasi-One-Dimensional Ferromagnet KEr(MoO₄)₂
    Autorzy:
    Tkáč, V.
    Orendáčová, A.
    Dlháň, L'.
    Orendáč, M.
    Boča, R.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030249.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.Es
    76.30.Kg
    75.30.Gw
    75.40.Gb
    Opis:
    We present the study of spin dynamics of KEr(MoO₄)₂ in the magnetic field applied along the hard axis c. The temperature dependence of AC susceptibility in zero magnetic field studied at frequencies f=10, 100, and 1000 Hz indicated the absence of relaxation in the temperature range from 2 to 20 K. Application of magnetic field induced a slow magnetic relaxation, which was investigated in detail in the field 0.5 T. The highest intensity of the relaxation process, reflected by the values of imaginary susceptibility was observed at 2 K. With increasing temperature, the relaxation process is weaker and vanishes completely above 3.5 K. Corresponding Cole-Cole diagrams were constructed and analyzed within a single relaxation process which can be associated with a direct relaxation process with a bottleneck effect, τ ≈1/T^b, and b=1.4. The slow relaxation at 2 K intensifies with increasing magnetic field at least up to 1 T.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 893-895
    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:
    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:
    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:
    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 Field Induced Slow Magnetic Relaxation in KEr(MoO₄)₂
    Autorzy:
    Tkáč, V.
    Orendáčová, A.
    Tarasenko, R.
    Pajerowski, D.
    Čižmár, E.
    Orendáč, M.
    Anders, A.
    Meisel, M.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385617.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.70.Ch
    75.30.Gw
    75.50.Xx
    75.78.-n
    Opis:
    The spin dynamics of a layered magnetic insulator, KEr(MoO₄)₂, have been investigated in a magnetic field applied along the easy axis at temperatures where the magnetism is dominated by the occupation of a ground doublet. More specifically, the DC magnetization and AC susceptibility were studied in magnetic fields up to 5 T and at temperatures ranging from 1.8 to 20 K. The temperature dependence of the AC susceptibility suggests a slowing down of magnetic relaxation with increasing magnetic field. The magnetic field dependence of the AC susceptibility, studied at nominally 2 K, indicates the presence of low-field, intermediate-field, and high-field regimes characterized by the interplay of internal and external magnetic fields that give rise to different relaxation processes.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 353-355
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tractor decelometric trials by application of the ecological hydraulic oil
    Autorzy:
    Tkáč, Z.
    Kosiba, J.
    Jablonický, J.
    Šinský, V.
    Shchur, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/411070.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    deceleration
    characteristics
    tractor
    Opis:
    In this article, there is resumed the accomplished impact analysis of biodegradable tractor oil HYDROS UNI application in gear - hydraulic circuit of the tractor Zetor Proxima 7441. This analysis was performed by comparative testing with standard mineral oil PP 80 on the basis of decelometric trials. Decelometric trials were carried out with measuring device XL - MeterTM Pro Gamma. The measurements were executed by the 3rd and the 4th unreduced gear. The results show that the oil HYDROS UNI does not affect decelometric characteristics of the tractor Zetor Proxima 7441.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2016, 5, 3; 171-175
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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