Speaker
Description
Molecular magnets [1] with quantum correlations offer exciting possibilities for applications in demagnetization processes, as well as rapid cooling and heating [2]. This rapidly growing field presents diverse opportunities that leverage the unique properties of molecular magnets, bridging multiple scientific disciplines. In this work, we investigate the low-temperature thermodynamic properties of hexanuclear Fe$^{3+}$ complexes [3]. This complex exhibits competing interactions, $J_1$, $J_2$, and $J_3$, leading to $S = 1/2$ ground spin states within Fe$_3$O triangular subunits. These subunits are coupled via the $J_3$ interaction, giving rise to intricate quantum behavior.
We explore the magnetic Grüneisen parameter as a function of the magnetic field, revealing a pronounced magnetocaloric effect. During an adiabatic demagnetization process, a sharp cooling effect is observed near the transition field, where a ground-state phase transition occurs. Our findings highlight the potential of the hexanuclear Fe$^{3+}$ complex for fast quantum cooling and heating applications.
Acknowledgements
H. Arian Zad acknowledges the financial support provided under the postdoctoral fellowship program of P. J. Šafárik University in Košice, Slovakia. This work was supported by Slovak Research and Development Agency under the contract No. APVV-20-0150. M. Jaščur was partly supported by the grant of Ministry of Education, Science, Research and Sport of the Slovak Republic under Contract No. VEGA 1/0695/23.
References
[1] Kahn, O., Molecular Magnetism. New York, NY, USA: Wiley-VCH, 1993
[2] H. A. Zad et al., “Single-ion anisotropy effects on the demagnetization process of the alternating weak-rung interacting mixed spin-(1/2, 1) Ising-Heisenberg double saw-tooth ladders,” Physica Scripta, vol. 95, no. 9. IOP Publishing, p. 095702, Aug. 07, 2020. https://doi.org/10.1088/1402-4896/aba663
[3] J. Goura et al., “Synthesis, Structure, and Magnetic Properties of Phosphinate‐Bridged Hexanuclear FeIII Complexes Containing Two Butterfly‐Shaped Fe3O Cores,” European Journal of Inorganic Chemistry, vol. 2015, no. 34. Wiley, pp. 5601–5610, Nov. 03, 2015. https://doi.org/10.1002/ejic.201500890
