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LaBaNiO4: a fermi glass


Schilling, A; Dell Amore, R; Karpinski, J; Bukowski, Z; Medarde, M; Pomjakushina, E; Müller, K A (2009). LaBaNiO4: a fermi glass. Journal of Physics: Condensed Matter, 21(1):015701.

Abstract

Polycrystalline samples of LaSr1–xBaxNiO4 show a crossover from a state with metallic transport properties for x = 0 to an insulating state as € x →1. The end member LaBaNiO4 with a nominal nickel Ni 3d7 configuration might therefore be regarded as a candidate for an antiferromagnetic insulator. However, we do not observe any magnetic ordering in LaBaNiO4 down to 1.5 K, and despite its insulating transport properties several other physical properties of LaBaNiO4 resemble those of metallic LaSrNiO4.
Based on an analysis of electrical and thermal-conductivity data as well as magneticsusceptibility and low-temperature specific-heat measurements we suggest that LaBaNiO4 is a Fermi glass with a finite electron density of states at the Fermi level but these states are localized

Abstract

Polycrystalline samples of LaSr1–xBaxNiO4 show a crossover from a state with metallic transport properties for x = 0 to an insulating state as € x →1. The end member LaBaNiO4 with a nominal nickel Ni 3d7 configuration might therefore be regarded as a candidate for an antiferromagnetic insulator. However, we do not observe any magnetic ordering in LaBaNiO4 down to 1.5 K, and despite its insulating transport properties several other physical properties of LaBaNiO4 resemble those of metallic LaSrNiO4.
Based on an analysis of electrical and thermal-conductivity data as well as magneticsusceptibility and low-temperature specific-heat measurements we suggest that LaBaNiO4 is a Fermi glass with a finite electron density of states at the Fermi level but these states are localized

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2009
Deposited On:09 Mar 2009 13:25
Last Modified:06 Dec 2017 16:54
Publisher:Institute of Physics Publishing
ISSN:0953-8984
Additional Information:This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics: Condensed Matter. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at http://dx.doi.org/10.1088/0953-8984/21/1/015701.
Publisher DOI:https://doi.org/10.1088/0953-8984/21/1/015701

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