Spin diffusion in the low-dimensional molecular quantum Heisenberg antiferromagnet Cu(pyz)(NO3)2 detected with implanted muons

Xiao, F.; Möller, J.S.; Lancaster, T.; Williams, R.C.; Pratt, F.L.; Blundell, S.J.; Ceresoli, D.; Barton, A.M.; Manson, J.L.

doi:10.1103/physrevb.91.144417

Spin diffusion in the low-dimensional molecular quantum Heisenberg antiferromagnet Cu(pyz)(NO3)2 detected with implanted muons

Xiao, F.; Möller, J.S.; Lancaster, T.; Williams, R.C.; Pratt, F.L.; Blundell, S.J.; Ceresoli, D.; Barton, A.M.; Manson, J.L.

Authors

F. Xiao

J.S. Möller

Professor Tom Lancaster tom.lancaster@durham.ac.uk
Professor

R.C. Williams

F.L. Pratt

S.J. Blundell

D. Ceresoli

A.M. Barton

J.L. Manson

Abstract

We present the results of muon-spin relaxation measurements of spin excitations in the one-dimensional quantum Heisenberg antiferromagnet Cu(pyz)(NO3)2. Using density-functional theory we propose muon sites and assess the degree of perturbation the muon probe causes on the system. We identify a site involving the muon forming a hydroxyl-type bond with an oxygen on the nitrate group that is sensitive to the characteristic spin dynamics of the system. Our measurements of the spin dynamics show that in the temperature range TN<T<J (between the ordering temperature TN and the exchange energy scale J) the field-dependent muon spin relaxation is characteristic of diffusive transport of spin excitations over a wide range of applied fields. We also identify a possible crossover at higher applied fields in the muon probe's response to the fluctuation spectrum, to a regime where the muon detects early-time transport with a ballistic character. This behavior is contrasted with that found for T>J and that in the related two-dimensional system Cu(pyz)2(ClO4)2.

Citation

Xiao, F., Möller, J., Lancaster, T., Williams, R., Pratt, F., Blundell, S., …Manson, J. (2015). Spin diffusion in the low-dimensional molecular quantum Heisenberg antiferromagnet Cu(pyz)(NO3)2 detected with implanted muons. Physical review B, 91(14), Article 144417. https://doi.org/10.1103/physrevb.91.144417

Journal Article Type	Article
Acceptance Date	Mar 31, 2015
Online Publication Date	Apr 22, 2015
Publication Date	Apr 22, 2015
Deposit Date	Apr 23, 2015
Publicly Available Date	Apr 28, 2015
Journal	Physical Review B
Print ISSN	1098-0121
Electronic ISSN	1550-235X
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	91
Issue	14
Article Number	144417
DOI	https://doi.org/10.1103/physrevb.91.144417
Related Public URLs	arXiv:1406.3202

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