Abstract
We present a tunneling study of the superconducting gap and pseudogap from near optimally doped submicron Bi${}_{2}$Sr${}_{2\ensuremath{-}x}$La${}_{x}$CuO${}_{6+\ensuremath{\delta}}$ intrinsic Josephson junctions whose self-heating is significantly suppressed. We find that as temperature decreases a pseudogap develops around ${T}^{\ensuremath{\star}}$ $=$ 165 K while the superconducting gap starts to open at ${T}_{c0}$ $=$ 40 K, which is well above the superconducting transition temperature ${T}_{c}$ of 30 K. We discuss the temperature-dependent properties of the superconducting phase and pseudogap phase. Our results demonstrate a clear two-gap feature of the system with precursor pairing up to ${T}_{c0}$.
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