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

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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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1 Acta Physica Polonica A

1 2000

1 Anders A.

1 Bondarenko V.

1 Feher A.

1 Horváth D.

1 Jaščur M.

1 Kačmár M.

1 Orendáč M.

1 Orendáčová A.

1 Čizmár E.

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