Charge-Density-Wave Origin of Dip-Hump Structures in the Tunnel Spectra of Bi2Sr2CaCu2O8+δ

T. Ekinoa, A.M. Gabovichb, M.S. Lic, M. Pękaład, H. Szymczakc and A.I. Voitenkob aHiroshima University, Faculty of Integrated Arts and Sciences, Higashi-Hiroshima, 739-8521, Japan bInstitute of Physics, Nauki Ave. 46, 03028 Kiev, Ukraine cInstitute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland dDepartment of Chemistry, Warsaw University, al.Żwirki i Wigury 101, 02-089 Warsaw, Poland

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Received: 14 09 2006;

We calculated the differential conductance G as the function of the bias voltage V across the tunnel junction between a normal metal or a conventional superconductor and an inhomogeneous superconductor with charge density waves. Spatial averaging over random domains with varying superconducting and normal state properties was carried out. For high-Tc oxides, irregularly distorted charge density wave patterns with spatially scattered values of various parameters were earlier shown to manifest themselves in a great body of experimental data. The results of calculation were applied to explain the well-known dip-hump structure in the G(V) dependence for Bi2Sr2CaCu2O8+δ and other cuprates.

DOI: 10.12693/APhysPolA.111.573 PACS numbers: 73.43.Jn, 71.45.Lr, 74.50.+r, 74.81.-g