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The dependence of the Josephson Plasma Resonance (JPR) frequency in heavilyunderdoped Bi2Sr2CaCu2O8+\delta on temperature and controlled pointlikedisorder, introduced by high-energy electron irradiation, is cross-correlatedand compared to the behavior of the ab-plane penetration depth. It is foundthat the zero temperature plasma frequency, representative of the superfluidcomponent of the c-axis spectral weight, decreases proportionally with T_c whenthe disorder is increased. The temperature dependence of the JPR frequency isthe same for all disorder levels, including pristine crystals. The reduction ofthe c-axis superfluid density as function of disorder is accounted for bypair-breaking induced by impurity scattering in the CuO2 planes, rather than byquantum fluctuations of the superconducting phase. The reduction of the c-axissuperfluid density as function of temperature follows a T^{2}--law and isaccounted for by quasi-particle hopping through impurity induced interlayerstates.

Nature of c-axis coupling in underdoped Bi2Sr2CaCu2O8 with varying degrees of disorder