Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 36: Molecular Magnetism and Magnetic Particles / Clusters I

MA 36.11: Talk

Wednesday, March 11, 2026, 17:45–18:00, POT/0151

Insights into magnetic and magnetocaloric features of 3d-4f nonanuclear Gd3Cu6 complex from a mixed spin-(7/2, 1/2) Heisenberg diamond cluster — •Jozef Strecka and Katarina Karlova — Pavol Jozef Safarik University, Kosice, Slovakia

Low-temperature magnetization curves and magnetocaloric features of 3d-4f molecular complex [Gd3Cu6L6(OH)6(CH3OH)6(H2O)6]Cl3.5H2O (LH2 = 1,1,1-trifluoro-7-hydroxy-4-methyl-5-aza-hept-3-en-2-one) to be further abbreviated as Gd3Cu6 are examined within the framework of exact diagonalization method as well as the cluster-based mean-field theory. The magnetic compound Gd3Cu6 reveals in low-temperature magnetization curves an intermediate magnetization plateau at 21.27 Bohr magnetons, which is far below the saturated magnetization value of 27 Bohr magnetons expected for three spin-7/2 Gd3+ and six spin-1/2 Cu2+ magnetic ions per magnetic molecule. The crystal structure of the Gd3Cu6 complex is built from three condensed cubane-like moeties Gd2Cu2, which are from the magnetic point of view equivalent with three corner-sharing diamond motifs. The nonanuclear coordination compound Gd3Cu6 thus affords an intriguing experimental realization of the mixed spin-(7/2, 1/2) Heisenberg diamond chain composed from three unit cell. The magnetic compound Gd3Cu6 displays at sufficiently low temperatures an enhanced magnetocaloric effect, which is due to a geometric spin frustration quite superior with respect to that one of paramagnetic salts built from Gd3+ magnetic ions.

This work was supported by the grant APVV-24-0091.

Keywords: Heisenberg spin cluster; geometric spin frustration; magnetization plateaus; magnetocaloric effect