Unusual quantum magnetic-resistive oscillations in a superconducting structure of two circular asymmetric loops in series

Abstract

We measured both quantum oscillations of a rectified time-averaged direct voltage V_{rec}(B) and a dc voltage V_{dc}(B) as a function of normal magnetic field B, in a thin-film aluminum structure of two asymmetric circular loops in series at temperatures below the superconducting critical temperature T_{c}. The V_{rec}(B) and V_{dc}(B) voltages were observed in the structure biased only with an alternating current (without a dc component) and only with a direct current (without an ac component), respectively. The aim of the measurements was to find whether interaction (nonlinear coupling) exists between quantum magnetic-resistive states of two loops at a large distance from each other. The distance between the loop centers was by an order of magnitude longer than the Ginzburg-Landau coherence length ξ(T). At such distance, one would not expect to detect any interaction between the quantum states of the loops. But we did find such an interaction. Moreover, we found that V_{dc}(B) functions (like V_{rec}(B) ones) can be used to describe the quantum states of the loops.

8 pages, 3 figures, published version

References in corpus (5)

• Coherent quantum phase slip
• Enhancement of the retrapping current of superconducting microbridges of finite length
• Rectified dc voltage versus magnetic field in a superconducting asymmetric figure-of-eight-shaped microstructure
• Asymmetry with respect to the magnetic field direction in the interaction between the quantum states of two coupled superconducting rings
• Quantum oscillations of rectified dc voltage as a function of magnetic field in an "almost" symmetric superconducting ring

Cited by in corpus (3)

• Quantum magnetoresistive (hc/2e)/m periodic oscillations in a superconducting ring
• Critical temperatures and critical currents of wide and narrow quasi-one-dimensional superconducting aluminum structures in zero magnetic field
• Negative nonlocal and local voltages (resistances) in a quasi-one-dimensional superconducting aluminum structure