Abstract

New dielectric transitions are observed at common temperatures 32K and 245K, in isostructural $La_{2}CuO_{4+x}$ and $La_{5/3}Sr_{1/3}NiO_{4},$ that are signatures of local lattice (octahedral) instabilities. The present dielectric transitions reveal new aspects of the phase diagram of the perovskite cuprates and nickelates. They suggest that competition and coexistence of superconductivity with dielectricity occurs that is analogous to that between superconductivity and anti-ferromagnetism. These results also indicate that inhomogeneous electronic states, such as charge stripes and oxygen ordering, are strongly connected to underlying lattice instabilities.

Notes

Originally posted at http://arxiv.org/abs/cond-mat/0108342v1.

Keywords

strongly correlated electrons, cuprates, nickelates, dielectric signatures, lattice instabilities, $La_{2-y}Sr_{y}MO_{4+x}$ (M=Cu, Ni)

Subject Categories

Condensed matter, Electrons, Superconductivity

Disciplines

Physics

Publication Date

2001

Click button above to open, or right-click to save.

Included in

Physics Commons

Share

COinS