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.
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
Permanent URL
Recommended Citation
Parimi, P. V.; Hakim, N.; Chou, F. C.; Cheong, S. W.; and Sridhar, S., "Dielectric signatures of lattice instabilities at 32K and 245K in $La_{2-y}Sr_{y}MO_{4+x}$ (M=Cu,Ni) Cuprates and Nickelates" (2001). Physics Faculty Publications. Paper 127. http://hdl.handle.net/2047/d20000738
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Notes
Originally posted at http://arxiv.org/abs/cond-mat/0108342v1.