Spin gap behavior in Cu$_2$Sc$_2$Ge$_4$O$_{13}$ by $^{45}$Sc nuclear magnetic resonance

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

doi:10.1103/PhysRevB.75.014426

paper

Spin gap behavior in Cu $_{2}$ Sc $_{2}$ Ge $_{4}$ O $_{13}$ by $^{45}$ Sc nuclear magnetic resonance

arXiv:cond-mat/0612106 · doi:10.1103/PhysRevB.75.014426

Abstract

We report the results of a $^{45}$ Sc nuclear magnetic resonance (NMR) study on the quasi-one-dimensional compound Cu $_{2}$ Sc $_{2}$ Ge $_{4}$ O $_{13}$ 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 $T_{ma x}$ $≃$ 170 K. Below , the NMR shifts and spin lattice relaxation rates clearly indicate activated responses, confirming the existence of a spin gap in Cu $_{2}$ Sc $_{2}$ Ge% $_{4}$ O $_{13}$ . 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 Cu $_{2}$ Sc $_{2}$ Ge $_{4}$ O $_{13}$ .

4 pages, 6 figures, submitted to Phys. Rev. B

References in corpus (1)

Magnetic excitation in a new spin gap compound Cu $_{2}$ Sc $_{2}$ Ge $_{4}$ O $_{13}$ : Comparison to Cu $_{2}$ Fe $_{2}$ Ge $_{4}$ O $_{13}$

Spin gap behavior in Cu2​Sc2​Ge4​O13​ by 45Sc nuclear magnetic resonance

Abstract

References in corpus (1)

Spin gap behavior in Cu $_{2}$ Sc $_{2}$ Ge $_{4}$ O $_{13}$ by $^{45}$ Sc nuclear magnetic resonance