The Magnetocaloric Effect in {[Cu(bapa)]₃[Cr(CN)₆]₂}ₙ · 6n H₂O at Low Temperatures

• Authors: K. Ráczová , M. Vavra , M. Hegedüs , E. Čižmár
• Languages of publication: EN

Abstracts

EN

The crystals of {[Cu(bapa)]₃[Cr(CN)₆]₂}ₙ·6nH₂O (bapa = bis(3-aminopropyl)amine) are formed by infinite Cu(II)-Cr(III) antiparallel chains, which are connected into the third direction by additive [Cu(bapa)] moieties. The onset of long-range magnetic order at 3.2 K was observed by AC susceptibility. The study of the magnetocaloric effect from magnetization measurements yields a large entropy change -ΔS_{M} = 13.65 J K¯¹mol¯¹ (-ΔS_{M} = 12.25 J kg¯¹K¯¹) at the field change from 0 T to 3 T at temperature 4 K. The analysis of the critical behavior of -ΔS_{M} suggests the value of critical exponent n = 0.577 at the ordering temperature characteristic for three-dimensional magnets with Ising anisotropy.

Keywords

EN

75.30.Sg; 75.30.Gw; 75.10.Pq

Discipline

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

• Journal: Acta Physica Polonica A
• Year: 2018
• Volume: 133
• Issue: 3
• Pages: 429-431

Dates

published

2018-03

Contributors

author

K. Ráczová

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

author

M. Vavra

• Institute of Chemistry, Faculty of Science, P.J. Šafárik University, Moyzesova 11, SK-041 54 Košice, Slovakia

author

M. Hegedüs

• Institute of Chemistry, Faculty of Science, P.J. Šafárik University, Moyzesova 11, SK-041 54 Košice, Slovakia

author

E. Čižmár

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

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Identifiers

DOI

10.12693/APhysPolA.133.429