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1
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Optical Properties of a Monoclinic Insulator Cu(H₂O)₂(en)SO₄

100%
Sýkora R., Postava K., Legut D., Tarasenko R.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
469-471
EN
We compare theoretically predicted, by means of ab-initio calculations, dielectric tensor and related experimental values obtained from Mueller-ellipsometry measurements of an insulating monoclinic (optically biaxial) crystal of Cu(H₂O)₂(en)SO₄, en=C₂H₈N₂. We concentrate on the static limit, ω→ 0.
2
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Experimental Study of Magnetic Properties of Alumina Ceramics

88%
Tarasenko R., Orendáčová A., Orendáč M., Kajňaková M., Feher A.
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issue 5
1067-1068
EN
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.
3
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Experimental Study of Magneto-Structural Correlations in Low-Dimensional Quantum Magnets Cu(en)Cl₂ and Cu(tn)Cl₂

88%
Tarasenko R., Lederová L., Orendáčová A., Orendáč M., Feher A.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
420-422
EN
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.
4
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Slow Magnetic Relaxation in the Highly Anisotropic Layered Crystal CsNd(MoO₄)₂

88%
Tkáč V., Orendáčová A., Tarasenko R., Orendáč M., Feher A.
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EN
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.
5
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Magnetocaloric Effect in CsDy(MoO₄)₂

76%
Tarasenko R., Tkáč V., Orendáčová A., Orendáč M., Sechovský V., Feher A.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
414-416
EN
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.
6
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Experimental Study of the Magnetocaloric Effect in Ni(en)(H₂O)₄SO₄·2H₂O - An S = 1 Molecular Magnet with Easy-Plane Anisotropy

76%
Tarasenko R., Orendáčová A., Čižmár E., Orendáč M., Potočňák I., Feher A.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
904-906
EN
Magnetocaloric properties of Ni(en)(H₂O)₄SO₄·2H₂O powder were investigated in temperature range from 2 K to 30 K in magnetic fields up to 7 T using isothermal magnetization measurements. The maximum value of the isothermal entropy change in the field 7 T is about 8 J/(kg K), with a refrigerant capacity of 55 J/kg. Temperature dependence of the isothermal entropy change under different magnetic fields is in good agreement with theoretical predictions from crystal electric field parameters.
7
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EPR Study of the Two-Dimensional Quantum System Cu(en)(H_2O)_2SO_4

76%
Tarasenko R., Orendáčová A., Čižmár E., Orendáč M., Zvyagin S., Wosnitza J.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1095-1097
EN
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.
8
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Experimental Study of the Magnetocaloric Effect in the Two-Dimensional Quantum System Cu(tn)Cl_2

76%
Baranová L., Tarasenko R., Orendáčová A., Orendáč M., Pavlík V., Feher A.
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vol. 126
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issue 1
256-257
EN
Magnetocaloric studies of a two-dimensional antiferromagnet Cu(tn)Cl_{2} (tn=1,3-diaminopropane=C_3H_{10}N_2) have been performed by adiabatic magnetization and demagnetization measurements, in the temperature range from 0.2 to 4 K and magnetic fields up to 2 T. The compound represents an S=1/2 spatially anisotropic triangular-lattice antiferromagnet. The magnetocaloric measurements were focused at the identification of the phase transition to the magnetically ordered state which was not indicated in the previous specific heat studies. Furthermore, the interplay of the magnetic-field induced easy-plane anisotropy and the intrinsic spin anisotropy present in the studied system should manifest in low magnetic fields. The obtained results of the magnetocaloric experiments of Cu(tn)Cl_{2} indicate a double crossover from the normal to inverse magnetocaloric effect (MCE). The first crossover from the normal to inverse MCE occurring at about 0.3 K can be attributed to the competition of the aforementioned anisotropies. The second crossover from the inverse to normal MCE observed at about 2.2 K might be ascribed to the formation of spin vortices stabilized by the easy-plane anisotropy introduced by magnetic field.
9
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[Ni(en)(H_2O)_4][SO_4]·2H_2O - an S = 1 Molecular Magnet with Easy-Plane Anisotropy

64%
Tarasenko R., Orendáčová A., Tibenská K., Potočňák I., Kajňaková M., Vlček A., Orendáč M., Feher A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
481-484
EN
Structural analysis of [Ni(en)(H_2O)_4][SO_4]·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.
10
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Magnetic Field Induced Slow Magnetic Relaxation in KEr(MoO₄)₂

64%
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.
11
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Influence of Pressure on the Magnetic Response of the Low-Dimensional Quantum Magnet Cu(H₂O)₂(C₂H₈N₂)SO₄

64%
Peprah M., VanGennep D., Blasiola B., Quintero P., Tarasenko R., Xia J., Hamlin J., Meisel M., Orendáčová A.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
901-903
EN
The influence of pressure on the low-dimensional molecular magnet Cu(H₂O)₂(en)SO₄ (en = ethylenediamine = C₂H₈N₂) has theoretically been shown to affect the exchange interactions of the material. Herein, the results of an experimental study of hydrostatic pressure effects on the temperature dependence of the magnetization are reported. Using two different pressure cells, the magnetization measurements were performed between 2 K and 9.6 K with pressures ranging from ambient to 5.0 GPa. The data preliminarily suggest the presence of a shift in the magnetization peak of the material at the lowest temperatures and at the highest applied pressures. These data serve as a guide for future experimental work employing pressure to study this intriguing system.
12
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Neutron and EPR Study of Cu(tn)Cl_{2} - a~Two-Dimensional Spatially Anisotropic Triangular-Lattice Antiferromagnet

52%
Tarasenko R., Orendáčová A., Čižmár E., Maťaš S., Orendáč M., Zeleňák V., Pavlík V., Siemensmeyer K., Zvyagin S., Wosnitza J., Feher A.
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vol. 126
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issue 1
232-233
EN
We have studied the temperature dependence of the lattice parameters and the influence of spin anisotropy on the electron paramagnetic spectra of Cu(tn)Cl_2, an S=1/2 quasi-two-dimensional spatially-anisotropic triangular-lattice Heisenberg antiferromagnet. The variation of the resonance fields with temperature reflects the presence of an easy-plane exchange anisotropy with J_{z}/J_{x,y}<1 and g-factor anisotropy, g_{z}/g_{x,y}>1.
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