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1
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The Rare-earth Based Single-ion Magnet CsNd(MoO_{4})_{2}

100%
Tkáč V., Tibenská K., Orendáčová A., Orendáč M., Anders A., Pavlík V., Feher A.
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vol. 126
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issue 1
244-245
EN
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.
2
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Scattering of Phonons in CsMnCl_3·2H_2O

84%
Tkáč V., Tibenská K., Orendáčová A., Orendáč M., Šebek J., Sechovský V., Anders A., Feher A.
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issue 5
950-952
EN
The thermal conductivity of the quasi-one-dimensional S = 5/2 Heisenberg antiferromagnet CsMnCl_3·2H_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.
3
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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

84%
Botko M., Cheranovskii V., Vasilets G., Čižmar E., Kajňaková M., Anders A., Starodub V., Feher A.
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vol. 126
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issue 1
20-21
EN
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.
4
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Magnetic Field Induced Slow Magnetic Relaxation in KEr(MoO₄)₂

84%
Tkáč V., Orendáčová A., Tarasenko R., Pajerowski D., Čižmár E., Orendáč M., Anders A., Meisel M., Feher A.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
353-355
EN
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.
5
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KEr(MoO_{4})_{2} and CsDy(MoO_{4})_{2} - Low-Dimensional Ising Magnets

84%
Kačmár M., Orendáčová A., Čizmár E., Horváth D., Orendáč M., Bondarenko V., Anders A., Feher A., Jaščur M.
Acta Physica Polonica A
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2000
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vol. 97
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issue 5
807-810
EN
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_{4})_{2} and CsDy(MoO_{4})_{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.
6
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CuBr_2(C_{10}H_8N_2) - S = 1/2 Two-Dimensional Rectangular Heisenberg Antiferromagnet

84%
Čižmár E., Kajňaková M., Orendáčová A., Orendáč M., Feher A., Anders A., Park J., Meisel M.
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issue 5
973-974
EN
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.
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