Crystal structure and magnetic properties of unusual 3D cyanide bridged {[Cu(bapa)]3[Cr(CN)6]2} ·6nH2O (bapa= bis(3-aminopropyl)amine) network

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

“…For details of the crystal structure see Ref. [3]. χ P close to the ordering temperature confirms LRO.…”

“…The spin-glass behavior below the LRO temperature was also observed in Prussian-blue analogues [6] due to a structural disorder. One can speculate that in (1) the complicated structure consisting of interwoven chains [3] may lead to the presence of additional frustrating exchange couplings. This would result in the appearance of glassy state below the LRO temperature.…”

“…Positive val-ues of ¡∆S M are expected for the normal MCE. In the presence of a FM exchange coupling between magnetic ions in coordination complexes the maximum value of ¡∆S M is reduced, but it is possible to enhance the magnetic cooling performance at higher temperatures and in small fields in comparison with paramagnetic system [3].…”

“…A ferromagnetic (FM) long-range ordering (LRO) appears at T C 3.2 K and the analysis of susceptibility confirmed the presence of a strong FM exchange interaction [3]. Further AC susceptibility studies confirm the ordering temperature and the MCE close to T C yields quite high entropy change ¡∆S M 12.25 J kg ¡1 K ¡1 at field change from * corresponding author; e-mail: katarina.raczova@student.upjs.sk 0 to 3 T only.…”