Abstract
We have studied the behavior of pronounced subgap structures in the current–voltage ( I– V) characteristics of intrinsic Josephson junctions in (Bi 1− x Pb x ) 2Sr 2CaCu 2O y (with x=∼0.15, ∼0.2) mesas at 4.2 K without and with 2–20 GHz microwave irradiation. Without microwave irradiation, the I– V characteristics exhibited a set of superconducting and resistive quasiparticle branches corresponding to the constituent intrinsic Josephson junctions, with accompanying small subgap structures on the quasiparticle branches. Under irradiation of relatively high power of microwaves, the pronounced hysteretic subgap structures reduced, and new fine structures appeared beside them on the quasiparticle branches. The appearance of both original and new fine subgap structures was interpreted with regard to the interference of Raman-optical phonons with ac Josephson current in the intrinsic Josephson junctions.
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