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

B. M. Huddart; M. Gomilšek; T. J. Hicken; F. L. Pratt; S. J. Blundell; P. A. Goddard; S. J. Kaech; J. L. Manson; T. Lancaster

doi:10.1103/PhysRevB.103.L060405

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

Strongly Correlated Electrons 2021-02-24 v1

Authors: B. M. Huddart , M. Gomilšek , T. J. Hicken , F. L. Pratt , S. J. Blundell , P. A. Goddard , S. J. Kaech , J. L. Manson , T. Lancaster

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Abstract

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.

Keywords

muon-spin spectroscopy sine-gordon spin chain magnetic order ballistic spin transport longitudinal-field muSR chiral spin chain

Cite

@article{arxiv.2006.13743,
  title  = {Magnetic order and ballistic spin transport in a sine-Gordon spin chain},
  author = {B. M. Huddart and M. Gomilšek and T. J. Hicken and F. L. Pratt and S. J. Blundell and P. A. Goddard and S. J. Kaech and J. L. Manson and T. Lancaster},
  journal= {arXiv preprint arXiv:2006.13743},
  year   = {2021}
}

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6 pages, 3 figures

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

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