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

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.

arXiv comment6 pages, 3 figures

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Cited by in corpus (8)

• Finite-temperature transport in one-dimensional quantum lattice models
• DFT+μ: Density Functional Theory for Muon Site Determination
• MuFinder: A program to determine and analyse muon stopping sites
• Megahertz dynamics in skyrmion systems probed with muon-spin relaxation
• Pseudo-easy-axis anisotropy in antiferromagnetic $S=1$ diamond-lattice systems Ni$X_2$(pym)${}_2$
• Magnetic properties of a staggered $S=1$ chain Ni(pym)(H${}_2$O)${}_2$(NO${}_3$)${}_2$ with an alternating single-ion anisotropy direction
• Sine-Gordon dynamics in spin transport
• Single-ion anisotropy driven chiral magnetic order in a spin-1 antiferromagnetic chain