Magnetocaloric Effect in NiCl₂(bipy) at Low Temperatures

• Authors: K. Ráczová , E. Čižmár , A. Feher
• Languages of publication: EN

Abstracts

EN

Magnetothermal properties of the compound NiCl₂(bipy), where bipy = 4,4'-bipyridine, were studied. The single-ion anisotropy of Ni(II) ions was estimated and its influence on magnetocaloric effect in NiCl₂(bipy) was investigated. Above the metamagnetic transition a maximum in the isothermal change of the magnetic entropy is reached near 11 K at field change from 0T to 7T with peak value -ΔS = 6J K¯¹ kg¯¹. The temperature dependence of ΔS above 7K agrees with the assumed easy-axis type of single-ion anisotropy. The inverse magnetocaloric effect, typical for ordered antiferromagnets, was observed in the ordered state of NiCl₂(bipy) only for isothermal magnetization in small fields up to 2T.

Keywords

EN

75.30.Sg; 75.30.Gw; 75.10.Pq

Discipline

• 75.10.Pq: Spin chain models
• 75.30.Gw: Magnetic anisotropy
• 75.30.Sg: Magnetocaloric effect, magnetic cooling(for cryogenics, see 07.20.Mc)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 922-924

Dates

published

2017-04

Contributors

author

K. Ráczová

• Institute of Physics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

author

E. Čižmár

• Institute of Physics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

author

A. Feher

• Institute of Physics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

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Identifiers

DOI

10.12693/APhysPolA.131.922