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Article Dans Une Revue Physical Review B Année : 2018

Josephson Coupling in the Dissipative State of a Thermally Hysteretic μ -SQUID

Résumé

Micron-sized superconducting interference devices ($\mu$-SQUIDs) based on constrictions optimized for minimizing thermal runaway are shown to exhibit voltage oscillations with applied magnetic flux despite their hysteretic behavior. We explain this remarkable feature by a significant supercurrent contribution surviving deep into the resistive state, due to efficient heat evacuation. A resistively shunted junction model, complemented by a thermal balance determining the amplitude of the critical current, describes well all experimental observations, including the flux modulation of the (dynamic) retrapping current and voltage by introducing a single dimensionless parameter. Thus hysteretic $\mu$-SQUIDs can be operated in the voltage read-out mode with a faster response. The quantitative modeling of this regime incorporating both heating and phase dynamics paves the way for further optimization of $\mu$-SQUIDs for nano-magnetism.

Dates et versions

hal-01857704 , version 1 (17-08-2018)

Identifiants

Citer

Sourav Biswas, Clemens Winkelmann, Hervé Courtois, Anjan K. Gupta. Josephson Coupling in the Dissipative State of a Thermally Hysteretic μ -SQUID. Physical Review B, 2018, 98 (17), pp.174514. ⟨10.1103/PhysRevB.98.174514⟩. ⟨hal-01857704⟩

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