Abstract
Polycrystalline samples of LaSr1−xBaxNiO4 show a crossover from a state with metallic transport properties forx = 0 to an insulating state as . The end member LaBaNiO4 with a nominal nickel Ni 3d7 configuration might therefore be regarded as a candidate for an antiferromagneticinsulator. However, we do not observe any magnetic ordering inLaBaNiO4 down to 1.5 K, and despite its insulating transport properties several other physical properties ofLaBaNiO4 resemble thoseof metallic LaSrNiO4. Based on an analysis of electrical and thermal-conductivity data as well asmagnetic-susceptibility and low-temperature specific-heat measurements, we suggest thatLaBaNiO4 is a Fermi glass with a finite electron density of states at the Fermi level but these statesare localized.
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