Electronic phase separation and high temperature superconductors

Conference · Tue Jan 11 04:00:00 EST 1994

OSTI ID:10119863

Kivelson, S A ^[1]; Emery, V J ^[2]

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1. Univ. of California, Los Angeles, CA (United States). Dept. of Physics
2. Brookhaven National Lab., Upton, NY (United States)

The authors review the extensive evidence from model calculations that neutral holes in an antiferromagnet separate into hole-rich and hole-poor phases. All known solvable limits of models of holes in a Heisenberg antiferromagnet exhibit this behavior. The authors show that when the phase separation is frustrated by the introduction of long-range Coulomb interactions, the typical consequence is either a modulated (charge density wave) state or a superconducting phase. The authors then review some of the strong experimental evidence supporting an electronically-driven phase separation of the holes in the cuprate superconductors and the related Ni oxides. Finally, the authors argue that frustrated phase separation in these materials can account for many of the anomalous normal state properties of the high temperature superconductors and provide the mechanism of superconductivity. In particular, it is shown that the T-linear resistivity of the normal state is a paraconductivity associated with a novel composite pairing, although the ordered superconducting state is more conventional.

• Research Organization: Brookhaven National Lab., Upton, NY (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 10119863
• Report Number(s): BNL--61338; CONF-931247--10; ON: DE95007302
• Country of Publication: United States
• Language: English

Related Subjects

665410
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETIC MATERIALS
CUPRATES
ELECTRIC CONDUCTIVITY
ELECTRONIC STRUCTURE
HIGH-TC SUPERCONDUCTORS
HOLES
MATHEMATICAL MODELS
NICKEL OXIDES
SUPERCONDUCTIVITY