Spin gap behavior in Cu2 Sc2 Ge4 O13 studied using Sc45 nuclear magnetic resonance

C. S. Lue, C. N. Kuo, T. H. Su, G. J. Redhammer

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11 引文 斯高帕斯(Scopus)

摘要

We report the results of a Sc45 nuclear magnetic resonance (NMR) study on the quasi-one-dimensional compound Cu2 Sc2 Ge4 O13 at temperatures between 4 and 300 K. This material has been a subject of current interest due to indications of spin gap behavior. The temperature-dependent NMR shift exhibits a character of low-dimensional magnetism with a negative broad maximum at Tmax 170 K. Below Tmax, the NMR shifts and spin lattice relaxation rates clearly indicate activated responses, confirming the existence of a spin gap in Cu2 Sc2 Ge4 O13. The experimental NMR data can be well fitted to the spin dimer model, yielding a spin gap value of about 275 K which is close to the 25 meV peak found in the inelastic neutron scattering measurement. A detailed analysis further points out that the nearly isolated dimer picture is proper for the understanding of spin gap nature in Cu2 Sc2 Ge4 O13.

原文English
文章編號014426
期刊Physical Review B - Condensed Matter and Materials Physics
75
發行號1
DOIs
出版狀態Published - 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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