Pseudogap-Like Phenomena in Cuprates as a Manifestation of Charge-Density Waves
T. Ekino a, A.M. Gabovich b, A.I. Voitenko b, Mai Suan Li c, H. Szymczak c and M. Pękała d
a Hiroshima University, Faculty of Integrated Arts and Sciences, Higashi-Hiroshima, 739-8521, Japan
b Institute of Physics, prospekt Nauki 46, 03028 Kiev, Ukraine
c Institute of Physics, Polish Academy of Sciences, al. Lotnik' ow 32/46, PL-02-668 Warsaw, Poland
d Department of Chemistry, University of Warsaw, al.. Zwirki i Wigury 101, PL-02-089 Warsaw, Poland
Full Text PDF
Received: 6 11 2007;
Differential conductance G as a function of the bias voltage V was measured for break-junctions of superconducting Bi2Sr2 CaCu2O8+δand YBa2Cu3O7-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-Tc 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.
DOI: 10.12693/APhysPolA.114.59
PACS numbers: 73.43.Jn, 71.45.Lr, 74.50.+r, 74.81.-g