Issue 1, 2018

Giant negative magnetoresistance in Ni(quinoline-8-selenoate)2


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.

Graphical abstract: Giant negative magnetoresistance in Ni(quinoline-8-selenoate)2

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Article information

Article type
13 Sep 2017
27 Nov 2017
First published
07 Dec 2017
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2018,20, 514-519

Giant negative magnetoresistance in Ni(quinoline-8-selenoate)2

N. Black, T. Daiki, M. M. Matsushita, J. D. Woollins, K. Awaga and N. Robertson, Phys. Chem. Chem. Phys., 2018, 20, 514 DOI: 10.1039/C7CP06273G

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