A THEORETICAL-MODEL FOR THE TUNNELING-GAP ANISOTROPY OBSERVED IN LAYERED COPPER-OXIDE HIGH-TEMPERATURE SUPERCONDUCTORS

被引：0
作者：
CASELLA, RC
机构：
[1] National Institute of Standards and Technology, Gaithersburg
来源：
SOLID STATE COMMUNICATIONS | 1991年 / 78卷 / 05期
关键词：
D O I：
10.1016/0038-1098(91)90687-Q
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
A two-band model, in which the pair constituents in one band are linked via double intermediate boson (IB) exchange with a third fermion in the other band, is invoked to understand the tunneling-gap anisotropy observed in Bi2Sr2CaCu2O8 single crystals. The coordinates of the two IBs and the third fermion are integrated out, leading to effective pair correlations. The theory is presently in agreement with the data and subject to further experimental test via more precise measurements. Within the model, present data imply that the IB cut-off omega > 0.3 eV. The observed broad i.r. excitation centered at almost-equal-to 3000 cm-1 is taken as a candidate for the (possibly composite) IB. Experimental implications are discussed in a general context.
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页码：377 / 379
页数：3
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