Low Temperature Physics: 39, 232 (2013); https://doi.org/10.1063/1.4795202 (15 pages)
Физика Низких Температур: Том 39, Выпуск 3 (Март 2013), c. 301-319    ( к оглавлению , назад )

Charge density waves in d-wave superconductors: thermodynamics and Josephson tunneling (Review Article)

A.M. Gabovich and A.I. Voitenko

Institute of Physics, National Academy of Sciences of Ukraine 46 Nauka Ave., Kyiv 03028, Ukraine
E-mail: gabovich@iop.kiev.ua

Received October 25, 2012


The problem of coexistence between charge-density-waves (CDWs) and superconductivity is revisited. Recent evidence was analyzed for different classes of materials with the emphasis on high-Tc oxides. For the latter, the model of the d-wave or extended s-wave Cooper pairing competing with checkerboard or unidirectional CDWs is suggested. The corresponding phase diagrams were plotted and used as a guide to predict new features in the tunnel or photoemission spectra. In the framework of the model concerned, dc Josephson tunneling through junctions involving CDW superconductors is examined. It is shown that CDWs distort current dependences on the angle between crystal axes and the junction plane inherent to d-wave superconductors leading to an extra periodicity.

PACS: 74.20.Fg BCS theory and its development;
PACS: 74.20.Rp Pairing symmetries (other than s-wave);
PACS: 74.50.+r Tunneling phenomena; Josephson effects;
PACS: 74.72.–h Cuprate superconductors;
PACS: 71.45.Lr Charge-density-wave systems.

Key words: charge-density-wave superconductors, d-pairing, cuprates, phase diagram, dc Josephson effect.