Extinction of impurity resonances in large-gap regions of inhomogeneous d-wave superconductors

被引：7

作者：

Andersen, Brian M. ^{[1
]}

Graser, S. ^{[2
]}

Hirschfeld, P. J. ^{[2
]}

机构：

[1] Univ Copenhagen, Nanosci Ctr, Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[2] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.78.134502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Impurity resonances observed by scanning tunneling spectroscopy in the superconducting state have been used to deduce properties of the underlying pure state. Here we study a long-standing puzzle associated with these measurements, the apparent extinction of these resonances for Ni and Zn impurities in large-gap regions of the inhomogeneous Bi(2)Sr(2)CaCu(2)O(8+x) superconductor. We calculate the effect of order parameter and hopping suppression near the impurity site and find that these two effects are sufficient to explain the missing resonances in the case of Ni. There are several possible scenarios for the extinction of the Zn resonances, which we discuss in turn; in addition, we propose measurements which could distinguish among them.

引用

页数：9

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