Short-time dynamics in s+is-wave superconductor with incipient bands
Marvin A. Müller, Pengtao Shen, Maxim Dzero, Ilya Eremin
DOI 10.1103/PhysRevB.98.024522 · Physical Review B
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Abstract
Motivated by the recent observation of the time-reversal symmetry broken state in K-doped BaFe2As2 superconducting alloys, we theoretically study the collective modes and the short time dynamics of the superconducting state with s+is-wave order parameter using an effective four-band model with two hole and two electron pockets. The superconducting s+is state emerges for incipient electron bands as a result of hole doping and appears as an intermediate state between s± (high number of holes) and s++ (low number of holes). The amplitude and phase modes are coupled giving rise to a variety of collective modes. In the s± state, we find that the collective excitations are the Higgs (amplitude) modes, while the Leggett mode is absent due to strong interband interaction. In the s+is and s++ state, we uncover a new coupled collective soft mode. Finally we compare our results with the s+id solution and find similar behavior of the collective modes as in the s+is state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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