Magnetic properties of Heisenberg triangular antiferromagnet V15 cluster studied by NMR

TitleMagnetic properties of Heisenberg triangular antiferromagnet V15 cluster studied by NMR
Publication TypeJournal Article
Year of Publication2007
AuthorsFurukawa Y, Nishisaka Y, Kumagai K, Kogerler P, Borsa F
Journal TitleHyperfine Interactions
Volume176
Pages65-68
Date PublishedApr
Type of ArticleProceedings Paper
ISBN Number0304-3843
Accession NumberISI:000259462700011
Keywordsexcitations, nanoscale molecular magnets, nmr, spin frustration, V-15
Abstract

The magnetic properties of an s=1/2 Heisenberg triangular antiferromagnet V15 have been studied by proton nuclear magnetic resonance (NMR) at very low temperature down to 100 mK using a He-3-He-4 dilution refrigerator. In total spin S-T=3/2 ground state above 2.7 Tesla, proton spin-lattice relaxation rate (1/T-1) shows thermally activated behavior as a function of temperature. On the other hand, a temperature independent behavior of 1/T-1 at very low temperatures is observed in frustrated S-T=1/2 ground state below 2.7 Tesla. Possible origins for the peculiar behavior of 1/T-1 will be discussed in terms of magnetic fluctuations due to spin frustration.

DOI10.1007/s10751-008-9614-z
Alternate JournalHyperfine Interact.