Manifestations of impurity-induced s± ⇒ s++ transition: multiband model for dynamical response functions

被引：33
|
作者：
Efremov, D. V. [1 ,2 ]
Golubov, A. A. [3 ,4 ]
Dolgov, O. V. [1 ,5 ]
机构：
[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
[2] IFW Dresden, D-01069 Dresden, Germany
[3] Univ Twente, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands
[4] Univ Twente, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands
[5] RAS, PN Lebedev Phys Inst, Moscow 117901, Russia
来源：
NEW JOURNAL OF PHYSICS | 2013年 / 15卷
关键词：
STATES; CONDUCTIVITY; DENSITY;
D O I：
10.1088/1367-2630/15/1/013002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigate the effects of disorder on the density of states, the single-particle response function and optical conductivity in multiband superconductors with s(+/-) symmetry of the order parameter, where s(+/-) -> s(++) transition may take place. In the vicinity of the transition, the superconductive gapless regime is realized. It manifests itself in anomalies in the above-mentioned properties. As a result, intrinsically phase-insensitive experimental methods such as angle-resolved photoemission spectroscopy, tunneling and terahertz spectroscopy may be used to reveal information about the underlying order parameter symmetry.
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页数：14
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