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We present the experimental study of magnetocaloric effect on powder sample [Cu(phen)(H2O)(2)]SO4 (phen = phenantroline = C12H8N2) in the temperature range from nominally 0.2 K to 4 K and in magnetic fields up to 2 T. The values of total entropy were extracted from the experimental data obtained by adiabatic demagnetization. The comparison was performed with the temperature dependence of the entropy for S = 1/2 paramagnet calculated at selected magnetic fields. The deviations observed below 0.6 T were attributed to internal field mediated by exchange coupling. In addition, the temperature response observed in [Cu(phen)(H2O)(2)]SO4 revealed very short relaxation time below 1 K. The comparison of the behavior observed at the end of the demagnetization in [Cu(phen)(H2O)(2)]SO4 and other systems suggests that the magnetocaloric effect can serve as an alternative tool for studying slow magnetic relaxation.

Magnetocaloric Study of S=1/2 Low-Dimensional Heisenberg Antiferromagnet [Cu(phen)(H2O)2]SO4

Magnetocaloric Study of S=1/2 Low-Dimensional Heisenberg Antiferromagnet [Cu(phen)(H₂O)₂]SO₄