Physics – Condensed Matter – Superconductivity
Scientific paper
2005-10-26
Phys. Rev. B 72, 144519-1 (2005)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevB.72.144519
Break-junction tunneling spectroscopy at temperatures 30-50 mK in high magnetic field is used to directly probe the quasiparticle density of states within the energy gap in a single crystal Bi2212 high-$T_c$ superconductor. The measured tunneling conductances $dI/dV(V)$ in the subgap region have a zero flat region with no evidence for a linear increase of the density of states with voltage. A number of tunnel break-junctions exhibited $dI/dV(V)$ curves with a second energy gap structure at the average magnitude 2$\Delta _{p-p}/e=13$ mV. Our data cannot be explained by either a pure $s$ pairing or a pure $d_{x^2-y^2}$ pairing.
Maude Duncan K.
Vedeneev Sergey I.
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