1. Spin dynamics of edge-sharing spin chains in SrCa13Cu24O41
- Author
-
Shinichiro Yano, Ekaterina Pomjakushina, Garry J. McIntyre, Kirrily C. Rule, Shiliang Li, Jason Gardner, Michel Kenzelmann, Clemens Ulrich, Guochu Deng, Chin-Wei Wang, Kazimierz Conder, Huiqian Luo, Paolo Imperia, Wei Ren, Richard A. Mole, Shixun Cao, and Dehong Yu
- Subjects
010302 applied physics ,Physics ,Condensed matter physics ,Spin dynamics ,Model fitting ,State (functional analysis) ,01 natural sciences ,Inelastic neutron scattering ,Spin wave ,0103 physical sciences ,Antiferromagnetism ,Condensed Matter::Strongly Correlated Electrons ,010306 general physics ,Excitation ,Spin-½ - Abstract
The low-energy magnetic excitation from the highly Ca-doped quasi-one-dimensional magnet $\mathrm{SrC}{\mathrm{a}}_{13}\mathrm{C}{\mathrm{u}}_{24}{\mathrm{O}}_{41}$ 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 ${J}_{a}=4.4\phantom{\rule{0.16em}{0ex}}\mathrm{meV}$. ${J}_{c}$ is antiferromagnetic and its value is close to the nearest-neighbor interactions of the similar edge-sharing spin-chain systems such as $\mathrm{CuGe}{\mathrm{O}}_{3}$. Comparing with the hole-doped spin chains in $\mathrm{S}{\mathrm{r}}_{14}\mathrm{C}{\mathrm{u}}_{24}{\mathrm{O}}_{41}$, which shows a spin gap due to spin dimers formed around Zhang-Rice singlets, the chains in $\mathrm{SrC}{\mathrm{a}}_{13}\mathrm{C}{\mathrm{u}}_{24}{\mathrm{O}}_{41}$ 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.
- Published
- 2018
- Full Text
- View/download PDF