Spin dynamics of edge-sharing spin chains in SrCa&lt;sub&gt;13&lt;/sub&gt;Cu&lt;sub&gt;24&lt;/sub&gt;O&lt;sub&gt;41&lt;/sub&gt;

Deng, Guochu; Yu, Dehong; Mole, Richard; Pomjakushina, Ekaterina; Conder, Kazimierz; Kenzelmann, Michel; Yano, Shin-ichiro; Wang, Chin-Wei; Rule, Kirrily C.; Gardner, Jason S.; Luo, Huiqian; Li, Shiliang; Ulrich, Clemens; Imperia, Paolo; Ren, Wei; Cao, Shixun; McIntyre, Garry J.

doi:10.1103/PhysRevB.98.184411

Spin dynamics of edge-sharing spin chains in SrCa₁₃Cu₂₄O₄₁

Deng G, Yu D, Mole R, Pomjakushina E, Conder K, Kenzelmann M, Yano S-ichiro, Wang C-W, Rule KC, Gardner JS, Luo H, Li S, Ulrich C, Imperia P, Ren W, Cao S & McIntyre GJ

Citation

Deng, G., Yu, D., Mole, R., Pomjakushina, E., Conder, K., Kenzelmann, M., … McIntyre, G. J. (2018). Spin dynamics of edge-sharing spin chains in SrCa₁₃Cu₂₄O₄₁. Physical Review B, 98(18), 184411 (8 pp.). https://doi.org/10.1103/PhysRevB.98.184411

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:5555

The low-energy magnetic excitation from the highly Ca-doped quasi-one-dimensional magnet SrCa₁₃Cu₂₄O₄₁ was studied in the magnetic ordered state by using inelastic neutron scattering. We observed the gapless spin-wave excitation, dispersive along the a and c axes but nondispersive along the b axis. Such excitations are attributed to the spin wave from the spin-chain sublattice. Model fitting to the experimental data gives the nearest-neighbor interaction J_c as 5.4 meV and the interchain interaction J_a =4.4meV. J_c is antiferromagnetic and its value is close to the nearest-neighbor interactions of the similar edge-sharing spin-chain systems such as CuGeO₃. Comparing with the hole-doped spin chains in Sr₁₄Cu₂₄O₄₁, which shows a spin gap due to spin dimers formed around Zhang-Rice singlets, the chains in SrCa₁₃Cu₂₄O₄₁ show a gapless excitation in this paper. We ascribe such a change from gapped to gapless excitations to holes transferring away from the chain sublattice into the ladder sublattice upon Ca doping.