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A muon spin relaxation study of the metal-organic magnet Ni(TCNQ)2.

Berlie, A. and Terry, I. and Giblin, S. and Lancaster, T. and Szablewski, M. (2013) 'A muon spin relaxation study of the metal-organic magnet Ni(TCNQ)2.', Journal of applied physics., 113 (17). 17E304.

Abstract

An investigation of the magnetism of the deuterated form of the metal-organic ferromagnet Ni(TCNQ)2 using the muon spin relaxation technique, is reported. Ni(TCNQ-D4)2 was synthesized in a similar manner to the protio-form, and the crystalline product formed was found to have a Curie temperature of TC=20 K . This transition temperature was 18% larger than that of the protio-form synthesized in our laboratory. Muon spin relaxation measurements were performed in Zero Field (ZF) and in Longitudinal Fields (LF) of up to 0.45 T. The ZF data confirmed that the sample undergoes a bulk ferromagnetic transition at a temperature similar to that observed by the bulk magnetization data. However, ZF measurements also showed that another transition occurs below approximately 6 K, which is believed to be a transition to a magnetic glassy state. The LF results indicate that a significant dynamical component to the magnetism is present below TC as LF fields up to 0.45 T cannot completely re-polarise the spins of the implanted muons. Moreover, at 5 mT, the data can be fit using a damped oscillatory function. Taken together, the ZF and LF results suggest the presence of two dominant sites for implanted muons, one of which is strongly coupled to the bulk magnetic transition and the other that is more weakly coupled and has a dynamical magnetic environment below TC . Such a situation may be a consequence of muon spin relaxation probing core and surface magnetic environments of nanoparticles or clusters.

Item Type:Article
Keywords:Muons, Glass transitions, Ferromagnetic materials, Ferromagnetism, Curie point.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1063/1.4798616
Publisher statement:© 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics 113, 17E304 (2013) and may be found at http://dx.doi.org/10.1063/1.4798616
Date accepted:No date available
Date deposited:09 July 2014
Date of first online publication:April 2013
Date first made open access:No date available

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