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

Huddart, B. M. and Gomilšek, M. and Hicken, T. J. and Pratt, F. L. and Blundell, S. J. and Goddard, P. A. and Kaech, S. J. and Manson, J. L. and Lancaster, T. (2021) 'Magnetic order and ballistic spin transport in a sine-Gordon spin chain.', Physical review B., 103 (6). L060405.


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.

Item Type:Article
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Publisher statement:© 2021 American Physical Society
Date accepted:25 January 2021
Date deposited:26 October 2021
Date of first online publication:15 February 2021
Date first made open access:26 October 2021

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