Anomalous magnetoresistance near the superconductor-insulator transition in ultrathin films of a−MoxSi1−x
S. Okuma, T. Terashima, N. Kokubo
DOI 10.1103/PhysRevB.58.2816 · Physical Review B
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Abstract
We have made systematic studies for both the zero-field and field-driven superconductor-insulator transitions in a series of 4-nm-thick films of amorphous MoxSi1−x at temperatures T down to ∼0.05 K and fields B up to 15 T. For superconducting films, we have observed an anomalous peak in the magnetoresistance R(B) and a subsequent decrease in R(B) with increasing B at low temperatures in fields higher than the critical field BxxC. This result, together with finding that the magnetoresistance is always positive for insulating films, may suggest the presence of localized Cooper pairs even at B>BxxC in the limit of T→0.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MoxSi1-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Mo Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.9 | Pressure not reported | unknown |
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