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Magnetic Properties of Anion-Radical Salts Based on TCNQ Anion Radical

100%
Radváková A., Kajňaková M., Feher A., Ziolkovskiy D., Starodub V.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
499-502
EN
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.
2
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Magnetic Specific Heat of Anion-Radical Salt [Ni(bipy)₃](TCNQ)₄·(CH₃)₂CO at Very Low Temperatures

100%
Šoltésová D., Čižmár E., Vasylets G., Starodub V., Feher A.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
925-927
EN
Thermodynamic studies of the anion-radical salt system [Ni(bipy)₃](TCNQ)₄·(CH₃)₂CO, where TCNQ is 7,7',8,8'-tetracyano-quinodimethane, are reported. The anion-radical salt systems based on TCNQ belong to a material class in which the arrangement of the anion-radical salt has considerable impact on the charge transfer and magnetic properties. The crystal structure of the studied compound consists of [Ni(bipy)₃]⁺² cations containing Ni⁺² ions and four types of crystallographically independent anion-radicals TCNQ^{·-} (A, B, C and D). These TCNQ^{·-} radicals form two different types of TCNQ^{·-} stacks (AABB and CCDD), where a strong exchange interaction is expected. The temperature dependence of the specific heat of a single crystal was studied in magnetic fields up to 5 T and in the temperature range from 0.4 K to 30 K. The temperature dependence of specific heat displays a broad Schottky-like maximum above 0.4 K. Using a single-ion approximation, the analysis of the temperature dependence of the specific heat below 10 K yields values for the anisotropy parameters, D/k_{B}=-1.95 K and E/k_{B}=0.3 K. These results suggest that the observed maximum in the specific heat originates from Ni⁺² ions while the exchange interaction between the transition metal ions and the TCNQ is negligible.
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Spin-Peierls Transition in (N-Me-Tetra-Me-Pz)(TCNQ)_{2}

100%
Kajňaková M., Botko M., Starodub V., Čižmár E., Feher A.
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vol. 126
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issue 1
254-255
EN
The new organic anion-radical salt (N-Me-Tetra-Me-Pz)(TCNQ)_{2}, (Pz = pyrazine) was studied as a low dimensional magnetic system. Heat capacity and EPR studies were performed in the temperature range from 2 to 300 K. The magnetic susceptibility was measured in the temperature range from 2 to 300 K and in magnetic fields of 100 mT and 1 T. The magnetic properties of this new system can be described as a dimerized Heisenberg spin S=1/2 chain possessing a spin-Peierls transition at 42 K.
4
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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

73%
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.
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