Charge-density-wav features in tunnel spectra of high-T superconductors

• Autorzy: Ekino T. , Gabovich A. M. , Li M. S. , Pękała M. , Szymczak H. , Voitenko A. I.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

superconductivity; pseudogap; charge-density wave; non-homogeneity; tunneling; diphump structure

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2008
• Tom: Vol. 15, nr 2
• Strony: 145--151
• Opis fizyczny: Bibliogr. 15 poz., wykr.

Twórcy

autor

Ekino T.

autor

Gabovich A. M.

autor

Li M. S.

autor

Pękała M.

autor

Szymczak H.

autor

Voitenko A. I.

• Hiroshima University, Faculty of Integrated Arts and Sciences, Higashi-Hiroshima, Japan,

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