Giant negative magnetoresistance in Ni(quinoline-8-selenoate)2
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The magnetic, structural, conductivity and magnetoresistance properties of [Ni(quinoline-8-selenoate)2] ([Ni(qs)2]) have been studied. Despite the insolubility of the material necessitating its study as a powdered sample, a remarkably high conductivity has been measured. The conductivity is an order of magnitude greater than the thin-film processable thiol analogue previously reported and has been interpreted through the same space-charge limited conduction mechanism with charges injected from the electrodes. The introduction of selenium, results in a material with conductivity approaching metallic due to the enhanced interaction between adjacent molecules. Additionally, under an applied magnetic field, the material displays a negative magnetoresistance effect above 35% at 2 K. The effect can still be observed at 200 K and is interpreted in terms of a double-exchange mechanism.
Black , N , Tonouchi , D , Matsushita , M M , Woollins , J D , Awaga , K & Robertson , N 2018 , ' Giant negative magnetoresistance in Ni(quinoline-8-selenoate) 2 ' Physical Chemistry Chemical Physics , vol 20 , no. 1 , pp. 514-519 . DOI: 10.1039/c7cp06273g
Physical Chemistry Chemical Physics
Copyright 2017 the authors. This Open Access Article is licensed under a Creative Commons Attribution 3.0 Unported Licence
Authors thank the University of St Andrews, the Leverhulme Trust (International Network Grant IN-2012-094) and the JSPS Core-to Core Program, A. Advanced Research Networks for support.
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