Level crossings and zero-field splitting in the {Cr-8}-cubane spin cluster studied using inelastic neutron scattering and magnetization

TitleLevel crossings and zero-field splitting in the {Cr-8}-cubane spin cluster studied using inelastic neutron scattering and magnetization
Publication TypeJournal Article
Year of Publication2010
AuthorsVaknin D, Garlea VO, Demmel F, Mamontov E, Nojiri H, Martin C, Chiorescu I, Qiu Y, Kogerler P, Fielden J, Engelhardt L, Rainey C, Luban M
Journal TitleJournal of Physics-Condensed Matter
Volume22
Pages466001
Date Published11/24
ISBN Number0953-8984
Accession NumberISI:000283838800020
Keywordsanisotropy, magnet, molecules
Abstract

Inelastic neutron scattering (INS) in variable magnetic field and high-field magnetization measurements in the millikelvin temperature range were performed to gain insight into the low-energy magnetic excitation spectrum and the field-induced level crossings in the molecular spin cluster {Cr-8}-cubane. These complementary techniques provide consistent estimates of the lowest level-crossing field. The overall features of the experimental data are explained using an isotropic Heisenberg model, based on three distinct exchange interactions linking the eight Cr-III paramagnetic centers (spins s = 3/2), that is supplemented with a relatively large molecular magnetic anisotropy term for the lowest S = 1 multiplet. It is noted that the existence of the anisotropy is clearly evident from the magnetic field dependence of the excitations in the INS measurements, while the magnetization measurements are not sensitive to its effects.

URL<Go to ISI>://000283838800020http://iopscience.iop.org/0953-8984/22/46/466001/pdf/0953-8984_22_46_466001.pdf
DOI10.1088/0953-8984/22/46/466001
Alternate JournalJ Phys-Condens Mat