Coherent versus Incoherent c-Axis Josephson Tunneling Between Layered Superconductors
Abstract
We calculate Ic(T) and Rn for both coherent and incoherent electron tunneling across a c-axis break junction between nu=s,dx2-y2-wave superconducting half spaces, each with c-axis bandwidth 2J. Coherent quasiparticle tunneling only occurs for voltages V<2J/e, leading to difficulties in measuring Rn for underdoped samples. The coherent part of Ic(0) is independent of Deltanu(0) for J/Deltanu(0)<<1, and can be large. Our results are discussed with regard to recent experiments.
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