Review of Off-Diagonal Long-Range Order and High-Temperature Superconductivity from Repulsive Electronic Correlations

• The question as to how off-diagonal long-range order (ODLRO) might arise from repulsive electron correlations in high-temperature superconductors is investigated. The review makes a fuller explanation of our recent work on this topic which is currently a central issue in the theory of high-temperature superconductivity. Particularly, we study the issue as to whether ODLRO can arise from repulsive electronic correlations. Pairs of electrons on Cuprate and the iron-based pnictide and chalcogenide alternant lattices may have a weak long-range attractive tail and much stronger short-range repulsive Coulomb interaction. The long-range attractive tail may find its origin in one of the many proposals for high-Tc superconductor and thus has an uncertain origin. Some possibilities arise from Friedel-type oscillations or polarization of the background but ultimately these must reflect the alternant nature of the lattice structure. Here, we make it plausible that such interacting electrons can cooperate to produce a superconducting state in which time-reversed pairs of electrons effectively avoid the repulsive part but dwell on average in the attractive region of the potential. The alternant lattice structure is thus central to the occurrence of most stable high-temperature superconductivity with dx2-y2 or sign alternating s-wave or s± condensate symmetries.

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NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Nyckelord

Fysik med inriktning mot kvantkemi

Physics with specialization in Quantum Chemistry

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