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

Nicholas Black; Daiki Tonouchi; Michio M. Matsushita; J. Derek Woollins; Kunio Awaga; Neil Robertson

doi:10.1039/c7cp06273g

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

Nicholas Black, Daiki Tonouchi, Michio M. Matsushita, J. Derek Woollins, Kunio Awaga, Neil Robertson

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Abstract

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.

Original language	English
Pages (from-to)	514-519
Journal	Physical Chemistry Chemical Physics
Volume	20
Issue number	1
Early online date	7 Dec 2017
DOIs	https://doi.org/10.1039/c7cp06273g
Publication status	Published - 7 Jan 2018

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10.1039/c7cp06273gLicence: CC BY

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Copyright 2017 the authors. This Open Access Article is licensed under a Creative Commons Attribution 3.0 Unported Licence
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Cite this

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title = "Giant negative magnetoresistance in Ni(quinoline-8-selenoate)2",

abstract = "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.",

author = "Nicholas Black and Daiki Tonouchi and Matsushita, {Michio M.} and Woollins, {J. Derek} and Kunio Awaga and Neil Robertson",

note = "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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AU - Black, Nicholas

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AU - Matsushita, Michio M.

AU - Woollins, J. Derek

AU - Awaga, Kunio

AU - Robertson, Neil

N1 - 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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N2 - 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.

AB - 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.

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

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Chalcogen Nitrogen compounds: Chalcogen Nitrogen Compounds for Electornics and Spintronics

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

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Chalcogen Nitrogen compounds: Chalcogen Nitrogen Compounds for Electornics and Spintronics

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