Collective modes and their coupling to pair-breaking excitations in layered d-wave superconductors

E. H. Hwang; S. Das Sarma

doi:10.1103/PhysRevB.52.R7010

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Collective modes and their coupling to pair-breaking excitations in layered d-wave superconductors

E. H. Hwang, S. Das Sarma

DOI 10.1103/PhysRevB.52.R7010 · Physical Review B

T1

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Abstract

Collective modes of a layered superconductor are calculated within the ladder-diagram approximation using a d-wave symmetry model for the gap function. The collective mode dispersion is essentially independent of the order-parameter symmetry (s or d wave) at long wavelengths. The coupling of collective modes to pair-breaking single-particle excitations, however, depends crucially on the order-parameter symmetry. While there is a strong mode-coupling effect as the plasmon approaches the superconducting gap for the s-wave system, the mode coupling in the d-wave case is weak and strongly dependent on the direction of the wave vector, vanishing in the nodal direction of the gap function.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
LaSrCuO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown