Pseudogap due to antiferromagnetic fluctuations and the phase diagram of high-temperature oxide superconductors

A reduction of the density of states near the Fermi energy in the normal state (pseudogap) of high-temperature oxide superconductors is examined on the basis of the two-dimensional tight-binding model with effective interactions due to antiferromagnetic fluctuations. By using antiferromagnetic corre...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2000, Vol.69 (6), p.1598-1601
Main Authors: SHIMAHARA, H, HASEGAWA, Y, KOHMOTO, M
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Nonconventional mechanisms (spin fluctuations, polaron and bipolaron theory, rvb theory, anyon mechanism, marginal fermi liquid, luttinger liquid, etc.)
Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.)
Physics
Superconductivity
Theory and models of superconducting state
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Summary:A reduction of the density of states near the Fermi energy in the normal state (pseudogap) of high-temperature oxide superconductors is examined on the basis of the two-dimensional tight-binding model with effective interactions due to antiferromagnetic fluctuations. By using antiferromagnetic correlation lengths which are phenomenologically assumed, the doping dependence of the pseudogap is obtained. The superconducting transition temperature decreases and eventually vanishes due to the pseudogap as the hole concentration is reduced.
ISSN:0031-9015
1347-4073
DOI:10.1143/JPSJ.69.1598