Magnetic order and ballistic spin transport in a sine-Gordon spin chain

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.

Abstract

We report the results of muon-spin spectroscopy (μ+SR) measurements on the staggered molecular spin chain [pym-Cu(NO3 )2(H2O)2] (pym = pyrimidine), a material previously described using sine-Gordon field theory. Zero-field μ+SR reveals a long range magnetically ordered ground state below a transition temperature TN = 0.23(1) K. Using longitudinal-field (LF) μ+SR we investigate the dynamic response in applied magnetic fields 0 < B < 500 mT and find evidence for ballistic spin transport. Our LF μ+SR measurements on the chiral spin chain [Cu(pym)(H2O)4]SiF6 · H2O instead demonstrate one-dimensional spin diffusion, and the distinct spin transport in these two systems suggests that additional anisotropic interactions play an important role in determining the nature of spin transport in S = 1/2 antiferromagnetic chains.

Citation

Huddart, B., Gomilšek, M., Hicken, T., Pratt, F., Blundell, S., Goddard, P., Kaech, S., Manson, J., & Lancaster, T. (2021). Magnetic order and ballistic spin transport in a sine-Gordon spin chain. Physical Review B, 103(6), Article L060405. https://doi.org/10.1103/physrevb.103.l060405

• Journal Article Type: Article
• Acceptance Date: Jan 25, 2021
• Online Publication Date: Feb 15, 2021
• Publication Date: Feb 1, 2021
• Deposit Date: Feb 16, 2021
• Publicly Available Date: Oct 26, 2021
• Journal: Physical Review B
• Print ISSN: 2469-9950
• Electronic ISSN: 2469-9969
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 103
• Issue: 6
• Article Number: L060405
• DOI: https://doi.org/10.1103/physrevb.103.l060405
• Public URL: https://durham-repository.worktribe.com/output/1280310