Abstract
Using an eight-terminal geometry, we have measured voltages in ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8+\mathrm{\ensuremath{\delta}}}$ single crystals with current injected both parallel and perpendicular to the crystallographic c axis and with magnetic fields H\ensuremath{\leqslant}3 kOe, H\ensuremath{\Vert}c axis. In a range of fields and temperatures for which the conductivity is Ohmic, our results disagree with a model that assumes classical electrodynamics. We believe that interlayer vortex coupling is responsible for nonlocal conductivity in this regime.
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