Importance of phase fluctuations in superconductors with small superfluid density
Article Abstract:
Phase fluctuations have an important role in superconductors characterized by low superconducting carrier density such as the organic and high-T(sub C) (transition temperature) oxide superconductors. Accordingly, in these materials, the characteristic mean-field behavior is not exhibited in the transition to the superconducting state and both classical and quantum phase fluctuations significantly affect low-temperature properties. The gross value of T(sub C) alongwith its variation from one material to another is regulated by the long-range phase order in certain quasi-two-dimensional materials.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Crossovers in cuprates
Article Abstract:
Angle-resolved photoemission studies show that single-particle excitation spectrum of cuprate high-temperature superconductors (HTS) contain pseudogaps. Cuprate HTSs have two crossover temperatures and the pseudogap is present at temperatures below that at which the second crossover occurs. The properties and magnitude of the pseudogaps in single-particle spectra are similar to those in the state below the transition temperature (T(sub c)). This indicates that the CuO2 planes develop local superconductance below the second crossover temperature which become global above T(sub c).
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Electronic liquid-crystal phases of a doped Mott insulator
Article Abstract:
Classical liquid crystal phases are intermediate between liquids and solids. Quantum analogue electronic liquid crystals are proposed with phases where the ground states is intermediate between a liquid and a crystal.It is shown how the liquid, nematic, smectic and crystalline phases arise, and their stability is assessed. Strong evidence of electronic liquid crystal phases in copper oxide superconductors has been found, and experimental 'signatures' are examined.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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