Collective modes in two-band superconductors in the dirty limit
A. Anishchanka, A. F. Volkov, K. B. Efetov
DOI 10.1103/PhysRevB.76.104504 · Physical Review B
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Abstract
We analyze collective modes in two-band superconductors in the dirty limit. It is shown that these modes exist at all temperatures T below Tc provided the frequency of the modes is higher than the inelastic scattering rate and lower than the energy gaps Δa,b. At low temperatures, these modes are related to counterphase oscillations of the condensate currents in each band. The spectrum of the collective oscillations is similar to the spectrum of the Josephson “plasma” modes in a tunnel Josephson junction but the velocity of the mode propagation in the case under consideration is much lower. At higher temperatures (Δb<T<Tc), the spectrum consists of two branches. One of them is gapless (soundlike) and the second one has a threshhold that depends on coupling between the bands. We formulate the conditions under which both types of collective modes can exist. The spectrum of the collective modes can be determined by measuring the I−V characteristics of a Josephson junction in a way as it was done by Carlson and Goldman [Phys. Rev. Lett. 34, 11 (1975)].
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
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