Nonlocal effect of local nonmagnetic impurity in high-Tc superconductors:: Induced local moment and huge residual resistivity

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:310

Article; Proceedings Paper

Kontani, Hiroshi ; Ohno, Masanori

关键词: nonmagnetic impurity;    spin fluctuations;    local moment GV(I);    FLEX;   

DOI  :  10.1016/j.jmmm.2006.10.862

来源: Elsevier

【 摘 要 】

We study a Hubbard model with a strong onsite impurity potential based on an improved fluctuation-exchange (FLEX) approximation, which we call the GV(I)-FLEX method. We find that (i) both local and staggered susceptibilities are strongly enhanced around the impurity. By this reason, (ii) the quasiparticle lifetime as well as the local density of states (DOS) are strongly suppressed in a wide area around the impurity (like a Swiss cheese hole), which causes the huge residual resistivity'' beyond the s-wave unitary scattering value. These results by the GV(I) method naturally explains the various impurity effects in HTSCs in a unified way, which had been a long-standing theoretical problem. (c) 2006 Elsevier B.V. All rights reserved.

【 授权许可】

Free