Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-09-13
Physics
Condensed Matter
Strongly Correlated Electrons
17 pages, 5 figures, 5 tables
Scientific paper
10.1088/0953-8984/21/1/015701
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 magnetic-susceptibility 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.
Bukowski Zbigniew
DellAmore R.
Karpinski Janusz
Medarde M.
Mueller Alex K.
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