Interlayer Tunneling Spectroscopy and Evidence for the Evolution of a Pseudogap in Bi_<b>2</b>Sr_<b>2</b>CaCu_<b>2</b>O_<b>8</b>

We report on interlayer tunneling spectroscopy using very thin stacks of intrinsic Josephson junctions fabricated on the surface of a Bi 2 Sr 2 CaCu 2 O 8 single crystal. It is found that a pseudogap evolves below 180 K and continues to exist below T c . It is also found that the superconducting gap evolves below T c within the pseudogap. As a consequence of this finding, it is shown that the semiconductive c -axis resistivity can be interpreted in a straightforward manner in terms of the pseudogap and that the tunneling resistance is temperature independent.

Перевод пока недоступен