Quasiparticle density of states in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ single crystals probed using tunneling spectroscopy at ultra-low temperatures in high magnetic fields

Abstract

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.

References in corpus (10)

• Tunneling into Current-Carrying Surface States of High T${}_c$ Superconductors
• Effect of chemical inhomogeneity in the bismuth-based copper oxide superconductors
• Predominantly Superconducting Origin of Large Energy Gaps in Underdoped Bi2Sr2CaCu2O8-d from Tunneling Spectroscopy
• Phase Fluctuations and Spectral Properties of Underdoped Cuprates
• Correlation of Tunneling Spectra in Bi2Sr2CaCu2O(8+delta) with the Resonance Spin Excitation
• Pseudogap in Bi2Sr2CaCu2O8+d studied by measuring anisotropic susceptibilities and out-of-plane transport
• Measurement of an Anisotropic Energy Gap in Single Plane Bi_2Sr_(2-x)La_xCuO_(6+d)
• Modeling scanning tunneling spectra of $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$
• The c-axis transport in naturally-grown Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ cross-whisker junctions
• Atomic Scale Imaging and Spectroscopy of a CuO_2 Plane at the Surface of Bi_2Sr_2CaCu_2O_{8+delta}

Cited by in corpus (7)

• Local electronic structure near oxygen dopants in BSCCO-2212: a window on the high-Tc pair mechanism?
• Thermalization and Possible Signatures of Quantum Chaos in Complex Crystalline Materials
• Biordered superconductivity and strong pseudogap state
• Evidence for a New Excitation at the Interface Between a High-Tc Superconductor and a Topological Insulator
• Josephson (001) tilt grain boundary junctions of high temperature superconductors
• Theory of Extrinsic and Intrinsic Tunnelling in Cuprate Superconductors
• Gap like structure in a nonsuperconducting layered oxycarbonate Bi${}_{2+x}$Sr${}_{4-x}$Cu${}_2$CO${}_3$O${}_{8+\delta }$ single crystal