Quasiparticle density of states in Bi$ 2$Sr$ 2$CaCu$ 2$O$ {8 δ}$ single crystals probed using tunneling spectroscopy at ultra-low temperatures in high magnetic fieldsReportar como inadecuado



 Quasiparticle density of states in Bi$ 2$Sr$ 2$CaCu$ 2$O$ {8 δ}$ single crystals probed using tunneling spectroscopy at ultra-low temperatures in high magnetic fields


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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 $dI-dVV$ 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 $dI-dVV$ 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.



Autor: S. I. Vedeneev; D. K. Maude

Fuente: https://archive.org/







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