Field-induced magnetoelastic instabilities in antiferromagnetic molecular wheels

Waldmann, O.; Dobe, C.; Ochsenbein, S. T.; Güdel, H. U.; Sheikin, I.

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Field-induced magnetoelastic instabilities in antiferromagnetic molecular wheels

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Sheikin, I.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Waldmann, O., Dobe, C., Ochsenbein, S. T., Güdel, H. U., & Sheikin, I. (2006). Field-induced magnetoelastic instabilities in antiferromagnetic molecular wheels. Physical Review Letters, 96(2): 027206.

Cite as: https://hdl.handle.net/21.11116/0000-000E-B4A1-0

Abstract

The magnetic torque of the antiferromagnetic molecular wheel CsFe8 was studied down to 50 mK and up to 28 T. Below about 0.5 K phase transitions were observed at the field-induced level crossings (LCs). Intermolecular magnetic interactions are very weak excluding field-induced magnetic ordering. A magnetoelastic coupling was considered. A generic model shows that the wheel structure is unconditionally unstable at the LCs, and the predicted torque curves explain the essential features of the data well.