Effective action approach to the Leggett's mode in two-band superconductors

被引：85
作者：
Sharapov, SC [1 ]
Gusynin, VP
Beck, H
机构：
[1] Univ Neuchatel, Inst Phys, CH-2000 Neuchatel, Switzerland
[2] Bogolyubov Inst Theoret Phys, UA-03143 Kiev, Ukraine
来源：
EUROPEAN PHYSICAL JOURNAL B | 2002年 / 30卷 / 01期
关键词：
D O I：
10.1140/epjb/e2002-00356-9
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We investigate a collective excitation (Leggett's mode) corresponding to small fluctuations of the relative phase of two condensates in two-band superconductor using the effective "phase only" action. We consider the possibility of observing Leggett's mode in MgB2 superconductor and conclude that for the known at present values of the two-band model parameters for MgB2 Leggett's mode arises above the two-particle threshold.
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页码：45 / 51
页数：7
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