Thermally activated dynamics of spontaneous perpendicular vortices tuned by parallel magnetic fields in thin superconducting films
Milind N. Kunchur, Manlai Liang, Alex Gurevich
DOI 10.1103/PhysRevB.86.024521 · Physical Review B
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Abstract
We report magnetotransport measurements on a superconducting molybdenum-germanium (MoGe) film of thickness d=50 nm in parallel magnetic fields and show evidence of a transition from a Meissner state to a resistive state of spontaneous perpendicular vortices generated by thermal fluctuations above a certain temperature T>Tv(B). Here Tv appears to match the vortex core explosion condition d≈4.4ξ(Tv), where ξ is the coherence length. For T>Tv, we observed that a nonlinear current-voltage (I-V) response (Ohmic at low currents and the power law V∝Iβ at higher I) is exponentially dependent on B2. We propose a model in which the resistive state at T>Tv is due to thermally activated hopping of spontaneous perpendicular vortices tuned by the pairbreaking effect of the parallel B.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.45 | Pressure not reported | unknown |
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