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

Xiao, F. and Möller, J. S. and Lancaster, T. and Williams, R. C. and Pratt, F. L. and Blundell, S. J. and Ceresoli, D. and Barton, A. M. and Manson, J. L. (2015) 'Spin diffusion in the low-dimensional molecular quantum Heisenberg antiferromagnet Cu(pyz)(NO3)2 detected with implanted muons.', Physical review B., 91 (14). p. 144417.


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.

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Publisher statement:Reprinted with permission from the American Physical Society: Physical Review B 91, 144417 © 2015 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:31 March 2015
Date deposited:28 April 2015
Date of first online publication:22 April 2015
Date first made open access:No date available

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