Exchange constants for a V15 magnetic molecular nanocluster

Abstract

The spin structure and ground-state energies of a V15 magnetic molecular nanocluster are calculated using a modified Lanczos method. The exchange interaction constants for the V15 magnetic nanocluster (J=290 K, J′=60 K, J1=30 K, J′′=200 K, and J2=68 K) are determined from the comparison of the calculated and experimental data. The exchange constants obtained differ significantly from those predicated earlier and permit one to describe quantitatively the magnetization of the V15 nanocluster in weak and strong magnetic fields.