2014/05/30 by David Vaknin, F. Demmel, Franz Demmel
Chemistry · Materials Science · Physics and Astronomy · #Advanced NMR Techniques and Applications #Antiferromagnetism #Atomic physics #Chemistry #Condensed matter physics #Crystallography #Excited state #Ground state #Hydrogen Storage and Materials #Inelastic neutron scattering #Ion #Magnetic susceptibility #Magnetism in coordination complexes #Neutron #Neutron scattering #Physics #Quantum mechanics #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.89.180411
published as Physical Review B 89, 180411(R) 2014
openalex publication_date 2014/05/30 · arxiv created 2014/06/03 · arxiv updated 2014/06/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Inelastic neutron scattering (INS) experiments under applied magnetic field at low temperatures show detailed low-lying magnetic excitations in the so-called tridiminshed iron icosahedron magnetic molecule. The magnetic molecule consists of nine iron Fe3+ (s=5/2) and three phosphorous atoms that are situated on the 12 vertices of a nearly perfect icosahedron. The three phosphorous atoms form a plane that separates the iron cluster into two weakly coupled three- and six-ion fragments, Fe3 and Fe6, respectively. The magnetic field INS results exhibit an S=1/2 ground state expected from a perfect equilateral triangle of the Fe3 triad with a powder averaged g value =2.00. Two sets of triplet excitations whose temperature and magnetic field dependence indicate an S=0 ground state with two nondegenerate S=1 states are attributed to the Fe6 fragment. The splitting may result from a finite coupling between the two fragments, single-ion anisotropy, antisymmetric exchange couplings, or from magnetic frustration of its triangular building blocks.