Abstract
Intrinsic tunneling spectroscopy in high magnetic field ( ) is used for a direct test of superconducting features in the quasiparticle density of states of pure Bi2212 and intercalated -Bi2212 high- superconductors. We were able to distinguish with great clarity two coexisting gaps: (i) the superconducting gap, which closes as , and (ii) the -axis pseudogap, which does not change either with or with . Strikingly different dependencies, together with previously observed different temperature dependencies of the two gaps, speak against a superconducting origin of the pseudogap.
- Received 5 July 2000
DOI:https://doi.org/10.1103/PhysRevLett.86.2657
©2001 American Physical Society