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Durham University

Department of Physics

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Publication details for Professor Tom Lancaster

Berlie, A., Terry, I. , Giblin, S., Lancaster, T. & Szablewski, M. (2013). A muon spin relaxation study of the metal-organic magnet Ni(TCNQ)2. Journal of Applied Physics 113(17): 17E304.

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Home > Publishers > AIP Publishing > Journal of Applied Physics > Volume 113, Issue 17 > Article
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A muon spin relaxation study of the metal-organic magnet Ni(TCNQ)2
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Adam Berlie1, Ian Terry1,a), Sean Giblin2, Tom Lancaster1 and Marek Szablewski1

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1 Department of Physics, University of Durham, South Road, Durham DH1 3LE, United Kingdom
2 Cardiff School of Physics and Astronomy, Cardiff University, Queens Buildings, The Parade, Cardiff CF24 3AA, United Kingdom
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a) Electronic mail: ian.terry@durham.ac.uk
J. Appl. Phys. 113, 17E304 (2013); http://dx.doi.org/10.1063/1.4798616
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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.