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1
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Thermodynamic Properties of Geometrically Frustrated S=1/2 XY Antiferromagnet Er_{2}Sn_{2}O_{7}

100%
Al Ghamdi N., Orendáčová A., Pavlík V., Orendáč M.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
264-265
EN
The magnetic susceptibility, specific heat and entropy of geometrically frustrated S=1/2 XY antiferromagnet Er_{2}Sn_{2}O_{7} are reported. It is shown, that temperature dependence of magnetic susceptibility above nominally 10 K is governed by crystal field effects. Systematic study of specific heat in magnetic fields up to 7 T enabled the estimation of exchange coupling, J/k<<4.6 K. Investigation of isothermal change of magnetic entropy upon magnetization from 1 T to 7 T revealed the absence of enhanced magnetocaloric effect. The obtained results suggest that frustration parameter f ≈140 proposed for Er_{2}Sn_{2}O_{7} earlier may be significantly overestimated.
2
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Microstructural Analysis and Transport Properties of RuO_2-Based Thick Film Resistors

88%
Gabáni S., Flachbart K., Pavlík V., Pietriková A., Gabániová M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
625-628
EN
RuO_2-based low temperature sensors appear as very good secondary thermometers, mainly in the temperature range below 4.2 K. This is due to their high temperature sensitivity and small magnetoresistance. Both properties are strongly influenced by the manufacturing process (mainly by firing temperature and firing time). In our contribution we show that the microstructure of sensors and the temperature dependence of their resistance R(T) down to 50 mK, in case when all sensors are prepared from the same paste, can be strongly influenced by change of the firing temperature from 800°C to 900°C. The paper also presents results on the X-ray microanalysis and the analysis of electrical conductivity of these sensors.
3
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The Rare-earth Based Single-ion Magnet CsNd(MoO_{4})_{2}

76%
Tkáč V., Tibenská K., Orendáčová A., Orendáč M., Anders A., Pavlík V., Feher A.
Acta Physica Polonica A
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2014
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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.
4
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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.
Acta Physica Polonica A
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2014
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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.
5
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Low Temperature Transport and Magnetic Properties of SmB_{6}

76%
Gabani S., Flachbart K., Pavlík V., Konovalova E., Paderno Y., Herrmannsdörfer T.
Acta Physica Polonica A
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2000
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vol. 97
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issue 3
419-422
EN
We present results of transport and magnetic properties of three single-crystalline samples of the intermediate valence small-gap semiconductor SmB_{6} at low temperatures. The received resistivity dependences of the samples below 0.5 K exhibit an activated behavior with an energy gap of a few mK. The temperature dependences of the magnetic susceptibility show an increase below 15 K which can be accounted for by impurities, by bare Sm^{3+} ions or by a small amount of in-gap magnetic 4f^{5}5d^{1} states.
6
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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.
Acta Physica Polonica A
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2014
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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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