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The magnetic field and temperature dependence of the in-plane tunnelingconductance $dI/dV(V)$ in high-quality nonsuperconducting (down to 10 mK)layered oxycarbonate Bi$_{2+x}$Sr$_{4-x}$Cu$_2$CO$_3$O$_{8+\delta}$ singlecrystals has been investigated using break junctions. Combining measurements ofthe in-plane magnetoresistivity $\rho_{ab}(T,H)$ and the magnetotunneling, wepresent evidence for the existence of a small "pseudogap" in anonsuperconducting cuprate, without local incoherent pairs or any correlationphenomena associated with superconductivity. We are unable to distinguish ifsuch a "pseudogap" is totally unrelated to superconductivity or if itsexistence is a necessary condition for the subsequent occurrence ofsuperconductivity with increasing carrier density in the sample.

Gap like structure in a nonsuperconducting layered oxycarbonate Bi$_{2+x}$Sr$_{4-x}$Cu$_2$CO$_3$O$_{8+\delta}$ single crystal