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

The magnetic, structural, conductivity and magnetoresistance properties of [Ni(quinoline-8-selenoate) ] ([Ni(qs) ]) 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...

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Published inPhysical chemistry chemical physics : PCCP Vol. 20; no. 1; pp. 514 - 519
Main Authors Black, Nicholas, Daiki, Tonouchi, Matsushita, Michio M, Woollins, J Derek, Awaga, Kunio, Robertson, Neil
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 01.01.2018
Subjects
Conductivity
Magnetic properties
Magnetoresistance
Magnetoresistivity
Quinoline
Selenium
Thin films
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Summary:The magnetic, structural, conductivity and magnetoresistance properties of [Ni(quinoline-8-selenoate) ] ([Ni(qs) ]) 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.
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ISSN:1463-9076
1463-9084
DOI:10.1039/c7cp06273g