Effect of gap suppression by superfluid current on the nonlinear microwave response of d-wave superconductors

E. J. Nicol; J. P. Carbotte

doi:10.1103/PhysRevB.73.174510

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Effect of gap suppression by superfluid current on the nonlinear microwave response of d-wave superconductors

E. J. Nicol, J. P. Carbotte

DOI 10.1103/PhysRevB.73.174510 · Physical Review B

T1

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Abstract

Recently several works have focused on the intrinsic nonlinear current in passive microwave filters as a tool for identifying d-wave order parameter symmetry in the high-Tc cuprates. Evidence has been found for d-wave pairing in YBCO and further work has ensued. Most of the theoretical work has been limited to low temperatures because it has not included the effect of the superfluid current on the energy gap. We find that this effect leads to important corrections above T∼0.2Tc, while leaving the 1∕T low-temperature behavior intact. A twofold increase in the nonlinear coefficient at temperatures of the order of ∼0.75Tc is found, and as T→Tc the nonlinearity comes entirely from the effects of the superfluid current on the gap. Impurity scattering has been included and, in addition, signatures for the case of d+s wave are presented.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBCO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown