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

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arxiv cond-mat/0409265 v1 pith:QWCTYYH3 submitted 2004-09-10 cond-mat.mes-hall cond-mat.other

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

Olivier Cador , Dante Gatteschi , Roberta Sessoli , Anne-Laure Barra , Grigore A. Timco , Richard E. P. Winpenny This is my paper
classification cond-mat.mes-hall cond-mat.other
keywords ringspinstripantiferromagneticchromiumfirstfrustratedfrustration
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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