Open AccessEffects of proximity coupling and substitutions for Ba-sites on the transition temperature and ARPES of high-T＿c superconductors
Author(s) -
Yang Zhi-hong,
Dunfu Shi,
Luo Da-Feng
Publication year - 2004
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.53.3902
Subject(s) - superconductivity , pairing , condensed matter physics , angle resolved photoemission spectroscopy , physics , coupling (piping) , proximity effect (electron beam lithography) , superconducting transition temperature , transition temperature , cooper pair , space (punctuation) , electronic structure , high temperature superconductivity , materials science , layer (electronics) , nanotechnology , metallurgy , linguistics , philosophy , resist , electron beam lithography
Taking into account the proximity effects of the CuO chain on the hig h-Tc superconductivity, we introduce an S-N (superconducting-normal) model with d-wave Cooper pairing in the S layer. The hopping interaction between the S and N layers shows the suppression effect on the transition temperature Tc from the Green's function obtained in the Nambu space. Based on this model, we investigat e the negative effects of the substitution for Ba-site on the transition tempera ture Tc in the Y-Ba-Cu-O system. Experimental observations are qualita tively con sistent with our theoretical results. Finally, the hump/dip/peak structure in th e line shapes of the angle-resolved photoemission of the high-Tc supercond uctors has also been discussed in the framework of the S-N model.