Hot-electron effects in the two-dimensional superconductor-insulator transition
| Autor: | K. H. Sarwa B. Tan, Allen M Goldman, Kevin A. Parendo |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Quantum phase transition
Physics Condensed matter physics 02 engineering and technology Electron 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Magnetic field Amorphous solid Superconductor Insulator Transition Electric field 0103 physical sciences 010306 general physics 0210 nano-technology Critical exponent Scaling |
| Zdroj: | Physical Review B. 74 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.74.134517 |
| Popis: | The parallel magnetic field tuned two-dimensional superconductor-insulator transition has been investigated in ultrathin films of amorphous Bi. The resistance is found to be independent of temperature on both sides of the transition below approximately $120\phantom{\rule{0.3em}{0ex}}\mathrm{mK}$. Several observations suggest that this regime is not intrinsically ``metallic'' but results from the failure of the films' electrons to cool. The onset of this temperature-independent regime can be moved to higher temperatures by either increasing the measuring current or the level of electromagnetic noise. Temperature scaling is successful above $120\phantom{\rule{0.3em}{0ex}}\mathrm{mK}$. Electric field scaling can be mapped onto temperature scaling by relating the electric fields to elevated electron temperatures. These results cast doubt in the case of ultrathin films on the existence of an intrinsic metallic regime and on the independent determination of the correlation length and dynamical critical exponents obtained by combining the results of electric field and temperature scaling. |
| Databáze: | OpenAIRE |
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