Field-induced magnetoelastic instabilities in antiferromagnetic molecular wheels

Details Field-induced magnetoelastic instabilities in antiferromagnetic molecular wheels Field-induced magnetoelastic instabilities in antiferromagnetic molecular wheels

2005-11-30

arxiv.org/abs/cond-mat/0511731v1

Phys. Rev. Lett. 96, 027206 (2006)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures, REVTEX4, to appear in PRL

Scientific paper

10.1103/PhysRevLett.96.027206

The magnetic torque of the antiferromagnetic molecular wheel CsFe8 was studied down to 50 mK and in fields up to 28 T. Below ca. 0.5 K phase transitions were observed at the field-induced level-crossings (LCs). Intermolecular magnetic interactions are very weak excluding an explanation in terms of field-induced magnetic ordering. A magneto-elastic 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.

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