image NMR of trimer cluster compound image Original Research Article

View the MathML sourceP31 NMR in View the MathML sourceS=12 linear cluster compound Sr3Cu3(PO4)4Sr3Cu3(PO4)4 was investigated. At any temperature, the spectrum corresponds to a typical overlap of two powder patterns, consistent with two inequivalent phosporous sites, having different components of the shift parameters. Intra-trimer exchange View the MathML source(J1=110±5K) and hyperfine field (Hhf)(Hhf) were directly obtained from temperature dependence of KisoKiso, considering View the MathML sourceS=12, Heisenberg linear trimer. The behavior of the HhfHhf for the two sites are quite different and reflects the formation of trimers below 100 K. The relaxation rate, 1/T11/T1 in the range 100–210 K, shows an activation View the MathML source(Δ/kB=43K) dependence of the spin excitation.