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The c-axis tunneling properties of both pristine Bi2212 and its HgBr$_2$intercalate have been measured in the temperature range 4.2 - 250 K.Lithographically patterned 7-10 unit-cell heigh mesa structures on the surfacesof these single crystals were investigated. Clear SIS-like tunneling curves forcurrent applied in the $\it c$-axis direction have been observed. The dynamicconductance d$I/$d$V(V)$ shows both sharp peaks corresponding to asuperconducting gap edge and a dip feature beyond the gap, followed by a widemaximum, which persists up to a room temperature. Shape of the temperaturedependence of the {\it c}-axis resistance does not change after theintercalation suggesting that a coupling between $\rm CuO_2$-bilayers haslittle effect on the pseudogap.Comment: 6 pages, 5 figures; presented at the Second Int Conf. New3Sc-1999  (Las Vegas, NV

PSEUDO-GAP FEATURES OF INTRINSIC TUNNELING IN (HgBr2)-Bi2212 SINGLE CRYSTALS

PSEUDO-GAP FEATURES OF INTRINSIC TUNNELING IN (HgBr₂)-Bi2212 SINGLE CRYSTALS