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LaBaNiO(4): a Fermi glass.

A Schilling¹, R Dell'amore, J Karpinski

¹Physics Institute of the Universität of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|August 6, 2011

Summary

LaBaNiO(4) exhibits insulating transport properties but lacks magnetic ordering, suggesting it is a Fermi glass. This indicates localized states despite a finite density of states at the Fermi level.

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Area of Science:

Materials Science
Condensed Matter Physics
Solid State Chemistry

Background:

LaSr(1-x)Ba(x)NiO(4) compounds display a transition from metallic to insulating behavior with increasing Ba content.
The end member LaBaNiO(4), with a Ni 3d(7) configuration, was hypothesized to be an antiferromagnetic insulator.

Purpose of the Study:

To investigate the electronic and magnetic properties of LaBaNiO(4).
To determine the nature of the insulating state in LaBaNiO(4) and its relationship to metallic LaSrNiO(4).

Main Methods:

Synthesis of polycrystalline LaSr(1-x)Ba(x)NiO(4) samples.
Electrical and thermal conductivity measurements.
Magnetic susceptibility and low-temperature specific heat measurements.

Main Results:

LaBaNiO(4) shows insulating transport properties but no magnetic ordering down to 1.5 K.
Physical properties of LaBaNiO(4) share similarities with metallic LaSrNiO(4).
Analysis indicates a finite density of states at the Fermi level, but these states are localized.

Conclusions:

LaBaNiO(4) is not an antiferromagnetic insulator.
The material is best described as a Fermi glass, characterized by localized states at the Fermi level.