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arXiv 1709.02569cond-mat.supr-con
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热滞回$μ$ - SQUID系统耗散态的Josephson耦合

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

Sourav Biswas, Clemens B. Winkelmann, Hervé Courtois, Anjan K. Gupta

摘要:

基于最小化热失控优化的收缩的半导体尺寸的超导干扰设备($μ$ -SQUID)被示出为呈现电压振荡与施加的磁通量,尽管它们的滞后行为。我们解释了这一显着的特点,一个显着的超导贡献深入到电阻状态,由于有效的散热。一个间接分流的结模型,辅以热平衡确定的临界电流的幅度,以及所有的实验观察,包括通过引入一个单一的无量纲参数的(动态)再俘获电流和电压的磁通调制。因此,滞后$μ$ -SQUID可以以更快的响应在电压读出模式下操作。这一制度的定量建模结合加热和相动力学铺平了道路,为进一步优化$μ$ -SQUID的纳米磁性。

英文摘要:

Micron-sized superconducting interference devices ($μ$-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 $μ$-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 $μ$-SQUIDs for nano-magnetism.

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