Field-Tuned Superconductor-Insulator Transition with and without Current Bias
E. Bielejec, Wenhao Wu
DOI 10.1103/PhysRevLett.88.206802 · Physical Review Letters
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Abstract
The magnetic-field-tuned superconductor-insulator transition has been studied in ultrathin beryllium films quench condensed near 20 K. In the zero-current limit, a finite-size scaling analysis yields the scaling exponent product νz=1.35±0.10 and a critical sheet resistance, Rc, of about 1.2RQ, with RQ=h/4e2. However, in the presence of dc bias currents that are smaller than the zero-field critical currents, νz becomes 0.75±0.10. This new set of exponents suggests that the field-tuned transitions with and without a dc bias current belong to different universality classes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Be Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure not reported | unknown |
| Be Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.5 | Pressure not reported | unknown |
| Be Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | unknown |
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