Electronic phase separation and high temperature superconductors

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:68453

Kivelson, S A ^[1]; Emergy, V J ^[2]

---

1. UCLA, Los Angeles, CA (United States)
2. Brookhaven National Laboratory, 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. They 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. They 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 they 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, they show 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: Los Alamos National Lab., NM (United States)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 68453
• Report Number(s): LA-UR--94-1148; CONF-931247--; ON: DE94009293; CNN: Grant DMR-93-12606
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
HOLES
PHASE STUDIES