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2008 | 114 | 1 | 59-66
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Pseudogap-Like Phenomena in Cuprates as a Manifestation of Charge-Density Waves

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Differential conductance G as a function of the bias voltage V was measured for break-junctions of superconducting Bi_2Sr_2CaCu_2O_{8+δ} and YBa_2Cu_3O_{7-δ}. The dependences G(V) for both materials clearly demonstrate the so-called dip-hump structures outside the gap region. A theory, which suggests the charge-density-wave origin of the dip-hump structures and explains its specific form by intrinsic inhomogeneity of cuprate materials, was developed. The well-known pseudogap features in the tunnel spectra of high-T_c oxides found both below and above the superconducting critical temperature are also described by the theory, which testifies that both the pseudogap and the dip-hump structures have the same origin. Competing theories and various G(V) peculiarities found for a number of superconducting oxides are briefly discussed.
  • Hiroshima University, Faculty of Integrated Arts and Sciences, Higashi-Hiroshima, 739-8521, Japan
  • Institute of Physics, prospekt Nauki 46, 03028 Kiev, Ukraine
  • Institute of Physics, prospekt Nauki 46, 03028 Kiev, Ukraine
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, PL-02-668 Warsaw, Poland
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, PL-02-668 Warsaw, Poland
  • Department of Chemistry, University of Warsaw, al. Zwirki i Wigury 101, PL-02-089 Warsaw, Poland
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