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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.
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.
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.
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