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

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

2002-05-07

arxiv.org/abs/cond-mat/0205131v2

Eur. Phys. J. B 30 (2002) 45

Physics

Condensed Matter

Superconductivity

9 pages, RevTeX4; final version published in EPJB

Scientific paper

10.1140/epjb/e2002-00356-9

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 MgB$_2$ superconductor and conclude that for the known at present values of the two-band model parameters for MgB$_2$ Leggett's mode arises above the two-particle threshold.

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