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Experimental Study of the Magnetocaloric Effect in Ni(en)(H₂O)₄SO₄·2H₂O - An S = 1 Molecular Magnet with Easy-Plane Anisotropy

100%

Tarasenko R., Orendáčová A., Čižmár E., Orendáč M., Potočňák I., Feher A.

Acta Physica Polonica A

2017

vol. 131

issue 4

904-906

Magnetocaloric properties of Ni(en)(H₂O)₄SO₄·2H₂O powder were investigated in temperature range from 2 K to 30 K in magnetic fields up to 7 T using isothermal magnetization measurements. The maximum value of the isothermal entropy change in the field 7 T is about 8 J/(kg K), with a refrigerant capacity of 55 J/kg. Temperature dependence of the isothermal entropy change under different magnetic fields is in good agreement with theoretical predictions from crystal electric field parameters.

[Ni(en)(H_2O)_4][SO_4]·2H_2O - an S = 1 Molecular Magnet with Easy-Plane Anisotropy

84%

Tarasenko R., Orendáčová A., Tibenská K., Potočňák I., Kajňaková M., Vlček A., Orendáč M., Feher A.

Acta Physica Polonica A

2008

vol. 113

issue 1

481-484

Structural analysis of [Ni(en)(H_2O)_4][SO_4]·2H_2O was performed and it suggests that the crystal field should play a dominant role in the magnetic properties of the system. This conjecture coincides well with the specific heat and susceptibility behaviour. The analysis confirmed that the compound can be treated as a spin 1 single molecule magnet with nonmagnetic ground state introduced by easy-plane single-ion anisotropy D/k_B≈11 K and neglecting in-plane anisotropy E/D <0.1.

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2 Acta Physica Polonica A

1 2017

1 2008

2 Feher A.

2 Orendáč M.

2 Orendáčová A.

2 Potočňák I.

2 Tarasenko R.

1 Kajňaková M.

1 Tibenská K.

1 Vlček A.

1 Čižmár E.

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Experimental Study of the Magnetocaloric Effect in Ni(en)(H₂O)₄SO₄·2H₂O - An S = 1 Molecular Magnet with Easy-Plane Anisotropy

[Ni(en)(H_2O)_4][SO_4]·2H_2O - an S = 1 Molecular Magnet with Easy-Plane Anisotropy