Bibliographic Details
| Title: |
Counterintuitive Consequence of Heating in Strongly-Driven Intrinsic-Junctions of Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ Mesas |
| Authors: |
Kurter, C., Ozyuzer, L., Proslier, T., Zasadzinski, J. F., Hinks, D. G., Gray, K. E. |
| Source: |
Phys. Rev. B 81, 224518 (2010) |
| Publication Year: |
2009 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons |
| More Details: |
Anomalously high and sharp peaks in the conductance of intrinsic Josephson junctions in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ (Bi2212) mesas have been universally interpreted as superconducting energy gaps, but here we show they are a result of heating. This interpretation follows from a direct comparison to the equilibrium gap, $\mathit \Delta$, measured in break junctions on similar Bi2212 crystals. As the dissipated power increases with a greater number of junctions in the mesa, the conductance peak abruptly sharpens and its voltage decreases to well below 2$\mathit \Delta$. This sharpening, found in our experimental data, defies conventional intuition of heating effects on tunneling spectra, but it can be understood as an instability into a nonequilibrium two-phase coexistent state. The measured peak positions occur accurately within the voltage range that an S-shaped backbending is found in the {\it calculated} current-voltage curves for spatially {\it uniform} self-heating and that S-shape implies the potential for the uniform state to be unstable.
Comment: 10 pages, 7 figures |
| Document Type: |
Working Paper |
| DOI: |
10.1103/PhysRevB.81.224518 |
| Access URL: |
http://arxiv.org/abs/0911.1420 |
| Accession Number: |
edsarx.0911.1420 |
| Database: |
arXiv |
