Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 22, Issue 46, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/22/46/466001
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Funding
- Office of Basic Energy Sciences, US Department of Energy [DE-AC02-07CH11358]
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
- NSF [DMR-0654118, DMR-0645408, DMR-0454672]
- FMU Professional Development Committee
- MEXT, Japan [451]
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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.
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