Structure, magnetization, and NMR studies of the spin-glass compound (LixV1-x)(3)BO5 (x approximate to 0.40 and 0.33)

TitleStructure, magnetization, and NMR studies of the spin-glass compound (LixV1-x)(3)BO5 (x approximate to 0.40 and 0.33)
Publication TypeJournal Article
Year of Publication2007
AuthorsZong X, Niazi A, Borsa F, Ma X, Johnston DC
Journal TitlePhysical Review B
Date PublishedAug
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000249155100123
KeywordsCUMN, dynamics, field, HOST NUCLEAR-RESONANCE, model, monte-carlo, phase, relaxation, TIME DECAY, transition

Structural and magnetic properties of (LixV1-x)(3)BO5 powders (x=0.33) and single crystals (x=0.40) were studied by x-ray diffraction, magnetization, and NMR measurements. Both powder and single crystal x-ray diffraction data are consistent with the previously reported structure of the system. Magnetization measurements show an overall antiferromagnetic interaction among vanadium spins and reveal a transition into a spin glass state at a sample and magnetic field dependent temperature below similar to 10 K. The high temperature (T > 20 K) susceptibility is analyzed using a linear spin trimer model suggested in the literature but such a model is found to be insufficient to explain the data. Li-7 and B-11 NMR studies indicate an inhomogeneous dynamics close to the zero-field spin-glass transition temperature. The distribution of electronic spin relaxation times is derived using a recently proposed method and the broad temperature-dependent distribution obtained gives a consistent description of the NMR results. The temperature dependence of the distribution indicates a strong slowing down of the local moment spin dynamics as the system cools toward the zero-field spin-glass transition temperature even in the presence of a strong applied magnetic field up to 4.7 T.

Alternate JournalPhys. Rev. B