Magnetic order and ballistic spin transport in a sine-Gordon spin chain
- Resource Type
- Working Paper
- Authors
- Huddart, B. M.; Gomilšek, M.; Hicken, T. J.; Pratt, F. L.; Blundell, S. J.; Goddard, P. A.; Kaech, S. J.; Manson, J. L.; Lancaster, T.
- Source
- Phys. Rev. B 103, 060405 (2021)
- Subject
- Condensed Matter - Strongly Correlated Electrons
- Language
We report the results of muon-spin spectroscopy ($\mu^+$SR) measurements on the staggered molecular spin chain [pym-Cu(NO$_3$)$_2$(H$_2$O)$_2$] (pym = pyrimidine), a material previously described using sine-Gordon field theory. Zero-field $\mu^+$SR reveals a long range magnetically-ordered ground state below a transition temperature $T_\mathrm{N}=0.22(1)$ K. Using longitudinal-field (LF) $\mu^+$SR we investigate the dynamic response in applied magnetic fields $0< B < 500$ mT and find evidence for ballistic spin transport. Our LF $\mu^+$SR measurements on the chiral spin chain [Cu(pym)(H$_2$O)$_4$]SiF$_6 \cdot $H$_2$O instead demonstrate one-dimensional spin diffusion and the distinct spin transport in these two systems likely reflects differences in their magnetic excitations.
Comment: 6 pages, 3 figures