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

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arxiv 2006.13743 v1 pith:BW7GP5CA submitted 2020-06-24 cond-mat.str-el

B. M. Huddart , M. Gomilšek , T. J. Hicken , F. L. Pratt , S. J. Blundell , P. A. Goddard , S. J. Kaech , J. L. Manson
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T. Lancaster
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classification cond-mat.str-el
keywords spinchainmagnetictransportballisticmeasurementssine-gordonapplied
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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.

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