2003/04/15 by Masashi Hase, Hase, Masashi, Kiyoshi Ozawa +3
Computer Science · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetism in coordination complexes #Nonlinear Dynamics and Pattern Formation #Strongly Correlated Electrons (cond-mat.str-el) #Theoretical and Computational Physics #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0304323
4 pages, 4 figures, 1 table. submitted to Phys. Rev. Lett
arxiv created 2003/04/15 · openalex publication_date 2003/04/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We measured the magnetic susceptibilities of Cu6Ge6O18-xH2O (x = 0 ∼ 6). Susceptibility above the antiferromagnetic (AF) transition temperature (T\rm N) agrees with susceptibility of the one-dimensional Heisenberg S = 1/2 model with competing AF interactions. From the estimated ratio between nearest-neighbor and next-nearest-neighbor AF exchange interactions, the spin system is probably located near a boundary between spin systems with gapless and gapped magnetic excitation. The value of T\rm N/T\rm max, where T\rm max is temperature at which the susceptibility is maximum, shows a unique dependence on x. The x dependence can be explained qualitatively by taking phase transition as a function of x and the effect of disorder into account.