Electrical transport properties and Kondo effect in La 1− x Pr x NiO 3−δ thin films

Abstract The Kondo effect has been a topic of intense study because of its significant contribution to the development of theories and understanding of strongly correlated electron systems. In this work, we show that the Kondo effect is at work in La1−x Pr x NiO3−δ (0 ≤ x ≤ 0.6) thin films. At low t...

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Autores principales:	Van Hien-Hoang, Nak-Kwan Chung, Heon-Jung Kim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/53a0034e09a44758b7a276776a801a50
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spelling	oai:doaj.org-article:53a0034e09a44758b7a276776a801a502021-12-02T13:34:57ZElectrical transport properties and Kondo effect in La 1− x Pr x NiO 3−δ thin films10.1038/s41598-021-84736-22045-2322https://doaj.org/article/53a0034e09a44758b7a276776a801a502021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84736-2https://doaj.org/toc/2045-2322Abstract The Kondo effect has been a topic of intense study because of its significant contribution to the development of theories and understanding of strongly correlated electron systems. In this work, we show that the Kondo effect is at work in La1−x Pr x NiO3−δ (0 ≤ x ≤ 0.6) thin films. At low temperatures, the local magnetic moments of the 3d e g electrons in Ni2+, which form because of oxygen vacancies, interact strongly with itinerant electrons, giving rise to an upturn in resistivity with x ≥ 0.2. Observation of negative magnetoresistance, described by the Khosla and Fisher model, further supports the Kondo picture. This case represents a rare example of the Kondo effect, where Ni2+ acts as an impurity in the background of Ni3+. We suggest that when Ni2+ does not participate in the regular lattice, it provides the local magnetic moments needed to scatter the conduction electrons in the Kondo effect. These results offer insights into emergent transport behaviors in metallic nickelates with mixed Ni3+ and Ni2+ ions, as well as structural disorder.Van Hien-HoangNak-Kwan ChungHeon-Jung KimNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Van Hien-Hoang Nak-Kwan Chung Heon-Jung Kim Electrical transport properties and Kondo effect in La 1− x Pr x NiO 3−δ thin films
description	Abstract The Kondo effect has been a topic of intense study because of its significant contribution to the development of theories and understanding of strongly correlated electron systems. In this work, we show that the Kondo effect is at work in La1−x Pr x NiO3−δ (0 ≤ x ≤ 0.6) thin films. At low temperatures, the local magnetic moments of the 3d e g electrons in Ni2+, which form because of oxygen vacancies, interact strongly with itinerant electrons, giving rise to an upturn in resistivity with x ≥ 0.2. Observation of negative magnetoresistance, described by the Khosla and Fisher model, further supports the Kondo picture. This case represents a rare example of the Kondo effect, where Ni2+ acts as an impurity in the background of Ni3+. We suggest that when Ni2+ does not participate in the regular lattice, it provides the local magnetic moments needed to scatter the conduction electrons in the Kondo effect. These results offer insights into emergent transport behaviors in metallic nickelates with mixed Ni3+ and Ni2+ ions, as well as structural disorder.
format	article
author	Van Hien-Hoang Nak-Kwan Chung Heon-Jung Kim
author_facet	Van Hien-Hoang Nak-Kwan Chung Heon-Jung Kim
author_sort	Van Hien-Hoang
title	Electrical transport properties and Kondo effect in La 1− x Pr x NiO 3−δ thin films
title_short	Electrical transport properties and Kondo effect in La 1− x Pr x NiO 3−δ thin films
title_full	Electrical transport properties and Kondo effect in La 1− x Pr x NiO 3−δ thin films
title_fullStr	Electrical transport properties and Kondo effect in La 1− x Pr x NiO 3−δ thin films
title_full_unstemmed	Electrical transport properties and Kondo effect in La 1− x Pr x NiO 3−δ thin films
title_sort	electrical transport properties and kondo effect in la 1− x pr x nio 3−δ thin films
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/53a0034e09a44758b7a276776a801a50
work_keys_str_mv	AT vanhienhoang electricaltransportpropertiesandkondoeffectinla1xprxnio3dthinfilms AT nakkwanchung electricaltransportpropertiesandkondoeffectinla1xprxnio3dthinfilms AT heonjungkim electricaltransportpropertiesandkondoeffectinla1xprxnio3dthinfilms
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Electrical transport properties and Kondo effect in La 1− x Pr x NiO 3−δ thin films

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