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Spin gap and superconducting fluctuations in Bi2Sr2CaCu2O8+ δprobed by63Cu NMR

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
62
Identifiers
DOI: 10.1016/s0022-3697(00)00121-9
Keywords
  • A. Oxides
  • D. Nuclear Magnetic Resonance
  • D. Superconductivity
Disciplines
  • Physics

Abstract

Abstract We report temperature dependence of the Gaussian component of spin-echo decay rate (1/ T 2G) in under, optimally and overdoped single crystals Bi 2Sr 2CaCu 2O 8+ δ (Bi2212) with the superconducting (SC) transition temperatures T c =79, 86, and 77.3 K, respectively. For all the samples, 1/ T 2G was found to decrease below a temperature T c ∗ lower than T ∗ but higher than T c. Here T ∗ is the temperature below which the ”pseudogap” emerges. T c ∗ undergoes a similar variation with T c as function of doping level. This result is corroborated by those results of nuclear spin–lattice relaxation rate 1/ T 1 and the Knight shift reported previously. These anomalies below T c ∗ are suggested to be precursive to the SC transition. Based on the NMR results, three crossover temperatures, T mK, T ∗ and T c ∗ are marked in the phase diagram on Bi2212.

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