Spin frustration effects in an odd-member antiferromagnetic ring and the magnetic Moebius strip

Details Spin frustration effects in an odd-member antiferromagnetic ring and the magnetic Moebius strip Spin frustration effects in an odd-member antiferromagnetic ring and the magnetic Moebius strip

2004-09-10

arxiv.org/abs/cond-mat/0409265v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 8 figures

Scientific paper

10.1016/j.jmmm.2004.11.159

The magnetic properties of the first odd-member antiferromagnetic ring comprising eight chromium(III) ions, S=3/2 spins, and one nickel(II) ion, S=1 spin, are investigated. The ring possesses an even number of unpaired electrons and a S=0 ground state but, due to competing AF interactions, the first excited spin states are close in energy. The spin frustrated ring is visualized by a Moebius strip. The ?knot? of the strip represents the region of the ring where the AF interactions are more frustrated. In the particular case of this bimetallic ring electron paramagnetic resonance (EPR) has unambiguously shown that the frustration is delocalized on the chromium chain, while the antiparallel alignment is more rigid at the nickel site.

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