Intrinsic Tunneling Spectra of Bi2Sr2CaCu2O8+δ near Optimal Doping
Abstract
We report tunneling spectra of near optimally doped Bi2Sr2CaCu2O8+δ intrinsic Josephson junctions with area of 0.09 μm2, which avoid some fundamental difficulties in the previous tunneling experiments and allow a stable temperature-dependent measurement. A d-wave Eliashberg analysis shows that the spectrum at 4.2 K can be well fitted by considering electron couplings to a bosonic magnetic resonance mode and a broad high-energy continuum. Above Tc, the spectra show a clear pseudogap that persists up to 230 K, and a crossover can be seen indicating two different pseudogap phases existing above Tc. The intrinsic electron tunneling nature is discussed in the analysis.
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