2006/12/05 by C. S. Lue, Chia‐Nung Kuo, C. N. Kuo +3 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Copper-based nanomaterials and applications #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.75.014426
4 pages, 6 figures, submitted to Phys. Rev. B
arxiv created 2006/12/05 · openalex publication_date 2007/01/22 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report the results of a 45Sc nuclear magnetic resonance (NMR) study on the quasi-one-dimensional compound Cu2Sc2Ge4O13 at temperatures between 4 and 300\phantom\rule0.3em0exK. 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\ensuremath≃170\phantom\rule0.3em0exK. Below Tmax, the NMR shifts and spin lattice relaxation rates clearly indicate activated responses, confirming the existence of a spin gap in Cu2Sc2Ge4O13. The experimental NMR data can be well fitted to the spin dimer model, yielding a spin gap value of about 275\phantom\rule0.3em0exK which is close to the 25\phantom\rule0.3em0exmeV 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 Cu2Sc2Ge4O13.