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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Abstract

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.

Original languageEnglish
Article number014426
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number1
DOIs
Publication statusPublished - 2007 Jan 29

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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