Level Crossings and Zero-Field Splitting in the Cr8}-Cubane Spin-cluster by Inelastic Neutron Scattering and Magnetization Studies

Published

November 17, 2010

Author(s)

David Vaknin, V. O. Garlea, F. Demmel, E. Mamontov, H. Nojiri, C. Martin, I. Chiorescu, Yiming Qiu, P. Kogerler, J. Fielden, L. Engelhardt, M. Luban, M. Luban

Abstract

Millikelvin inelastic neutron scattering in variable magnetic field and high-field magnetization measurements were performed to gain insight into the low-energy magnetic excitation spectrum and the field-induced level crossings in the molecular spin cluster Cr₈}-cubane. These complementary techniques provide consistent estimates of the lowest level-crossing field. The overall features of the experimental data are accounted for 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 INS measurements, while the magnetization measurements were not sensitive to its effects.

Citation

Physical Review B

Volume

22

Pub Type

Journals

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Keywords

Molecular magnet, Cr8, inelastic neutron scattering

Citation

Vaknin, D. , Garlea, V. , Demmel, F. , Mamontov, E. , Nojiri, H. , Martin, C. , Chiorescu, I. , Qiu, Y. , Kogerler, P. , Fielden, J. , Engelhardt, L. , Luban, M. and Luban, M. (2010), Level Crossings and Zero-Field Splitting in the {Cr₈}-Cubane Spin-cluster by Inelastic Neutron Scattering and Magnetization Studies, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904136 (Accessed April 19, 2024)