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Superconducting fluctuations and anomalous diamagnetism in underdoped from magnetization and NMR-NQR relaxation measurements

Physical Review B - Condensed Matter and Materials Physics, ISSN: 1550-235X, Vol: 61, Issue: 18, Page: 12420-12426
2000
  • 44
    Citations
  • 0
    Usage
  • 6
    Captures
  • 0
    Mentions
  • 0
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    44
    • Citation Indexes
      44
  • Captures
    6

Article Description

Magnetization and (Formula presented) nuclear magnetic resonance-nuclear quadrupole resonance relaxation measurements are used to study the superconducting fluctuations in (Formula presented) (YBCO) oriented powders. In optimally doped YBCO the fluctuating negative magnetization (Formula presented) is rather well described by an anisotropic Ginzburg-Landau (GL) functional and the curves (Formula presented) cross at (Formula presented) In underdoped YBCO, instead, over a wide temperature range an anomalous diamagnetism is observed, stronger than in the optimally doped compound by about an order of magnitude. The field and temperature dependence of (Formula presented) cannot be described either by an anisotropic GL functional or on the basis of scaling arguments. The anomalous diamagnetism is more pronounced in samples with a defined order in the Cu(1)O chains. The (Formula presented) relaxation rate shows little, if any, field dependence in the vicinity of the transition temperature (Formula presented) It is argued how the results in the underdoped compounds can be accounted for by the presence of charge inhomogeneities, favored by chains ordering. © 2000 The American Physical Society.

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