CHARGE-DENSITY-WAV FEATURES IN TUNNEL SPECTRA OF HIGH-T SUPERCONDUCTORS
Journal Title: Metrology and Measurement Systems - Year 2008, Vol 15, Issue 2
Abstract
Tunnel conductance G(V) was calculated for junctions between a normal metal and a spatially inhomogeneous superconductor with a dielectric gap on the nested sections of the Fermi surface or between two such superconductors. The dielectric gapping was considered to be a consequence of the charge density wave (CDW) appearance. Spatial averaging was carried out over domains with randomly varying parameters of the CDW superconductor (CDWS). The calculated G(V)s demonstrate a smooth transformation from patterns with a pronounced dip-hump structure (DHS) at low temperature, T, into those with a pseudogap depletion of the electron density of states at higher T within the range of actual critical temperatures of the CDWS domains. Thus, it is shown that both the DHS and the pseudogap have the same origin. This circumstance provides a new insight into the problem and explains the peculiar features of G(V) for Bi2Sr2CaCu2O8+δ and related high-Tc cuprates. At the same time, the approach, being quite general, can be applied to other CDWSs which belong to various other classes of materials.
Authors and Affiliations
T. EKINO, A. GABOVICH, M. LI, H. SZYMCZAK
Keywords
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