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Experimental Studies of S=1 Heisenberg Planar Antiferromagnetic Chain Ni(C_{11}H_{10}N_{2}O)_{2}Ni(CN)_{4}

100%

Čizmár E., Černák J., Orendáč M., Herrmannsdörfer T., Feher A.

Acta Physica Polonica A

2000

vol. 97

issue 3

579-582

In this paper we discuss the results of experimental studies of specific heat and magnetic susceptibility of chain compound Ni(C_{11}H_{10}N_{2}O)_{2}Ni(CN)_{4}. We have observed a Schottky type anomaly at T=2.2 K in a temperature dependence of specific heat and the compound was identified as a S=1 Heisenberg antiferromagnetic chain with the subcritical exchange coupling D/k_{B}=5 K, D/|J|=5.2 and the strong in-plane anisotropy E/k_{B}=2.8 K. It has been found that the in-plane anisotropy affects the region of validity of a diluted exciton model [1] and a strong coupling model [2] for S=1 Heisenberg chains with the strong planar anisotropy. The analysis suggests that the in-plane anisotropy should be considered in any attempt to find a compound potentially located in the boundary of Haldane and "large-D" phases.

KEr(MoO_{4})_{2} and CsDy(MoO_{4})_{2} - Low-Dimensional Ising Magnets

73%

Kačmár M., Orendáčová A., Čizmár E., Horváth D., Orendáč M., Bondarenko V., Anders A., Feher A., Jaščur M.

Acta Physica Polonica A

2000

vol. 97

issue 5

807-810

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.

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2 Acta Physica Polonica A

2 2000

2 Feher A.

2 Orendáč M.

2 Čizmár E.

1 Anders A.

1 Bondarenko V.

1 Herrmannsdörfer T.

1 Horváth D.

1 Jaščur M.

1 Kačmár M.

1 Orendáčová A.

1 Černák J.

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Experimental Studies of S=1 Heisenberg Planar Antiferromagnetic Chain Ni(C_{11}H_{10}N_{2}O)_{2}Ni(CN)_{4}

KEr(MoO_{4})_{2} and CsDy(MoO_{4})_{2} - Low-Dimensional Ising Magnets